using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static void Main()
    {
        var t = NN;
        var res = new char[t];
        for (var u = 0; u < t; ++u)
        {
            var x = ReadLine();
            var y = ReadLine();
            res[u] = Compare(x, y);
        }
        WriteLine(string.Join("\n", res));
    }
    static char Compare(string x, string y)
    {
        if (x[0] > y[0]) return 'X';
        if (x[0] < y[0]) return 'Y';
        if (IsRepeat(x, y))
        {
            if (x.Length > y.Length) return 'X';
            else return 'Y';
        }
        var pos = 1;
        while (true)
        {
            var xi = pos % x.Length;
            var yi = pos % y.Length;
            if (xi == 0 && yi == 0) break;
            if (x[xi] > y[yi]) return 'X';
            if (x[xi] < y[yi]) return 'Y';
            ++pos;
        }
        return ' ';
    }
    static bool IsRepeat(string x, string y)
    {
        var gcd = GCD(x.Length, y.Length);
        var glist = x.Take(gcd).ToArray();
        for (var i = gcd; i < x.Length; ++i)
        {
            if (x[i] != glist[i % gcd]) return false;
        }
        for (var i = 0; i < y.Length; ++i)
        {
            if (y[i] != glist[i % gcd]) return false;
        }
        return true;
    }
    static int GCD(int a, int b)
    {
        if (a < b) return GCD(b, a);
        if (a % b == 0) return b;
        return GCD(b, a % b);
    }
}