import java.util.*;

// System.out.println();

public class help {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		int totalPackages = 0;
		int[] packages;
		while(true) {
			totalPackages = sc.nextInt();
			if(totalPackages > 0) {
				// System.out.println("vstup: " + totalPackages);
				
				packages = new int[totalPackages];
				
				for(int index = 0; index < totalPackages; index++) {
					packages[index] = sc.nextInt();
				}
				
				// System.out.println(Arrays.toString(packages));
				Arrays.sort(packages);
				// System.out.println(Arrays.toString(packages));
				
				boolean first = true;
				for(int index = 0; index < totalPackages; index++) {
					System.out.print(packages[index]);
					
					if(first) {
						System.out.print("-A");
						first = false;
					} else {
						System.out.print("-B");
						first = true;
					}
					
					if(index < totalPackages - 1) {
						System.out.print(" ");
					}
				}
				
				System.out.println();
			} else {
				break;
			}
		}
	}
}