//package die;

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */


import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

/**
 *
 * @author cteam015
 */
public class Die {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) throws IOException {
        // TODO code application logic here
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String st; 
        int counter = 0;
        
        char[][] pole = new char[3][3];
        for (int i = 0; i < 3; i++) {
            st =br.readLine();
            for (int j = 0; j < 3; j++) {
                pole[i][j]=st.charAt(j);
                if (pole[i][j]=='o') {
                    counter++;
                }
            }
        }
        
        if (counter>6) {
            System.out.println("unknown");
        }
        else{
            switch (counter) {
                case 1:
                    if (pole[1][1]=='o') {
                        System.out.println("1");
                    }else{
                        System.out.println("unknown");
                    }   break;
                case 2:
                    if ((pole[2][2] == 'o' && pole[0][0] == 'o') || (pole[0][2] == 'o' && pole[2][0] == 'o') ) {
                        System.out.println("2");
                    }else{
                        System.out.println("unknown");
                    }   break;
                case 3:
                    if ((pole[1][1]=='o'&&pole[0][0]=='o'&&pole[2][2]=='o')||
                            (pole[1][1]=='o'&&pole[0][2]=='o'&&pole[2][0]=='o')) {
                        System.out.println("3");
                    }else{
                        System.out.println("unknown");
                    }   break;
                case 4:
                    if (pole[0][0]=='o'&&pole[2][0]=='o'&&pole[2][2]=='o'&& pole[0][2]=='o'){
                        System.out.println("4");
                    }else{
                        System.out.println("unknown");
                    }   break;
                case 5:
                    if (pole[1][1]=='o'&&pole[0][0]=='o'&&pole[2][0]=='o'&&pole[2][2]=='o'&& pole[0][2]=='o'){
                        System.out.println("5");
                    }else{
                        System.out.println("unknown");
                    }   break;
                default:
                    if ((pole[0][1]=='o'&&pole[0][2]=='o'&&pole[0][0]=='o'&&pole[2][0]=='o'&& pole[2][1]=='o'&& pole[2][2]=='o')||
                            (pole[0][0]=='o'&&pole[1][0]=='o'&&pole[2][0]=='o'&&pole[0][2]=='o'&& pole[1][2]=='o'&& pole[2][2]=='o')) {
                        System.out.println("6");
                    }else{
                        System.out.println("unknown");
                    }   break;
            }
        }
        
    }
    
}