#include <bits/stdc++.h>
using namespace std;

#ifdef _RUTHEN
#include "debug.hpp"
#else
#define show(...) true
#endif

using ll = long long;
#define rep(i, n) for (int i = 0; i < (n); i++)
template <class T> using V = vector<T>;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    int tt;
    cin >> tt;
    while (tt--) {
        string X, Y;
        cin >> X >> Y;
        string XY = X + Y, YX = Y + X;
        if (XY < YX) {
            cout << 'Y' << '\n';
        } else if (XY > YX) {
            cout << 'X' << '\n';
        } else {
            if (X.size() < Y.size()) {
                cout << 'Y' << '\n';
            } else {
                cout << 'X' << '\n';
            }
        }
    }
    return 0;
}