#include <bits/stdc++.h>

using namespace std;

#ifdef LOCAL
#include <algo/debug.h>
#else
#define debug(...) 42
#endif

int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  int tt;
  cin >> tt;
  while (tt--) {
    string x, y;
    cin >> x >> y;
    int n = (int) min(x.size(), y.size());
    int ans = -1;
    for (int i = 0; i < n; i++) {
      if (x[i] < y[i]) {
        ans = 0;
      } else if (x[i] > y[i]) {
        ans = 1;
      }
    }
    if (ans == -1) {
      n = 2 * max((int) x.size(), (int) y.size());
      for (int i = 0; i < n; i++) {
        int px = i % (int) x.size();
        int py = i % (int) y.size();
        if (x[px] < y[py]) {
          ans = 0;
        } else if (x[px] > y[py]) {
          ans = 1;
        }
      }
    }
    if (ans == -1) {
      ans = (x.size() < y.size() ? 0 : 1);
    }
    cout << (ans == 0 ? "Y" : "X") << '\n';
  }
  return 0;
}