Main.java

 
import java.util.Scanner;
 
/**
 *
 * @author cteam049
 */
public class Main {
 
    enum Morse {
        A(".-"),
        B("-..."),
        C("-.-."),
        D("-.."),
        E("."),
        F("..-."),
        G("--."),
        H("...."),
        I(".."),
        J(".---"),
        K("-.-"),
        L(".-.."),
        M("--"),
        N("-."),
        O("---"),
        P(".--."),
        Q("--.-"),
        R(".-."),
        S("..."),
        T("-"),
        U("..-"),
        V("...-"),
        X("-..-"),
        W(".--"),
        Y("-.--"),
        Z("--.."),
        u("..--"),
        c(".-.-"),
        p("---."),
        q("----");
 
        String sym;
        int length;
 
        Morse(String sym) {
            this.sym = sym;
            this.length = sym.length();
        }
 
        public String getMorse() {
            return sym;
        }
 
        public int getLength() {
            return length;
        }
 
        public static Morse getValue(String sym) {
            if (".-".equals(sym)) {
                return A;
            } else if ("-...".equals(sym)) {
                return B;
            } else if ("-.-.".equals(sym)) {
                return C;
            } else if ("-..".equals(sym)) {
                return D;
            } else if (".".equals(sym)) {
                return E;
            } else if ("..-.".equals(sym)) {
                return F;
            } else if ("--.".equals(sym)) {
                return G;
            } else if ("....".equals(sym)) {
                return H;
            } else if ("..".equals(sym)) {
                return I;
            } else if (".---".equals(sym)) {
                return J;
            } else if ("-.-".equals(sym)) {
                return K;
            } else if (".-..".equals(sym)) {
                return L;
            } else if ("--".equals(sym)) {
                return M;
            } else if ("-.".equals(sym)) {
                return N;
            } else if ("---".equals(sym)) {
                return O;
            } else if (".--.".equals(sym)) {
                return P;
            } else if ("--.-".equals(sym)) {
                return Q;
            } else if (".-.".equals(sym)) {
                return R;
            } else if ("...".equals(sym)) {
                return S;
            } else if ("-".equals(sym)) {
                return T;
            } else if ("..-".equals(sym)) {
                return U;
            } else if ("...-".equals(sym)) {
                return V;
            } else if ("-..-".equals(sym)) {
                return X;
            } else if (".--".equals(sym)) {
                return W;
            } else if ("-.--".equals(sym)) {
                return Y;
            } else if ("--..".equals(sym)) {
                return Z;
            } else if ("..--".equals(sym)) {
                return u;
            } else if (".-.-".equals(sym)) {
                return c;
            } else if ("---.".equals(sym)) {
                return p;
            } else if ("----".equals(sym)) {
                return q;
            }
            throw new IllegalArgumentException();
        }
 
    }
 
 
 
    private static String solve(String line) {
        String newLine = line.replaceAll("_", "u")
                .replaceAll(",", "c")
                .replaceAll("\\.", "p")
                .replaceAll("\\?", "q");
        StringBuilder morseSB = new StringBuilder();
        StringBuilder lengthSB = new StringBuilder();
 
        for (int i=0; i<newLine.length() ; i++) {
            char ch = newLine.charAt(i);
//            System.out.println(String.valueOf(ch) + " " + Morse.valueOf(String.valueOf(ch)).getMorse());
            morseSB.append(Morse.valueOf(String.valueOf(ch)).getMorse());
            lengthSB.append(Morse.valueOf(String.valueOf(ch)).getLength());
        }    
 
 
        String lengthString = lengthSB.reverse().toString();
        String morseString = morseSB.toString();
 
//        System.out.println("*********");
//        System.out.println(morseString);
//        System.out.println(lengthString);
//        System.out.println("*********");
 
        int pointer = 0;
        morseSB.delete(0, morseSB.capacity());
 
        for (int i=0; i<lengthString.length() ; i++) {
            int len = Integer.parseInt( String.valueOf( lengthString.charAt(i) ) );
//            System.out.println(morseString.substring(pointer, pointer+len));
//            System.out.println( Morse.getValue( morseString.substring(pointer, pointer+len) ) );
            morseSB.append( Morse.getValue(morseString.substring(pointer, pointer+len)) );
            pointer = pointer+len;
        }
 
        return morseSB.toString().replaceAll("u", "_")
                .replaceAll("c", ",")
                .replaceAll("p", "\\.")
                .replaceAll("q", "\\?");
    }
 
    public static void main(String[] args) {
        String line = null;
        Scanner sc = new Scanner(System.in);
        while (sc.hasNext()) {
            line = sc.next();
            System.out.println(solve(line));
        }
    }
 
}