1129

import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int n;
        int[] a = new int[5];
        while (true) {
            n = scan.nextInt();
            if (n == 0) {
                break;
            }
            for (int i = 0; i < n; i++) {
                int ss = -1;
                for (int j = 0; j < 5; j++) {
                    a[j] = scan.nextInt();
                    if (a[j] <= 127) {
                        if (ss == -1) {
                            ss = j;
                        } else {
                            ss = 123;
                        }
                    }
                }
                if (ss > -1 && ss < 5) {
                    System.out.println((char) (ss + 65));
                } else {
                    System.out.println('*');
                }
            }
        }
    }
}