#include "iostream"
#include "climits"
#include "list"
#include "queue"
#include "stack"
#include "set"
#include "functional"
#include "algorithm"
#include "string"
#include "map"
#include "unordered_map"
#include "unordered_set"
#include "iomanip"
#include "cmath"
#include "random"
#include "bitset"
#include "cstdio"
#include "numeric"
#include "cassert"
#include "ctime"

using namespace std;

//constexpr long long int MOD = 1000000007;
constexpr long long int MOD = 998244353;
constexpr double EPS = 1e-8;

//int N, M, K, T, H, W, L, R;
long long int N, M, K, T, H, W, L, R;

int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);

	cin >> T;
	while (T--) {
		string s, t;
		cin >> s >> t;
		bool flag = false;
		if (s.size() > t.size()) {
			swap(s, t);
			flag = true;
		}
		if (s > t) {
			flag ^= true;
		}
		else {
			string u, v;
			while (u.size() < t.size() * 3) {
				u += s;
			}
			while (v.size() < t.size() * 3) {
				v += t;
			}
			u.resize(v.size());
			if (u > v)flag ^= true;
		}
		if (flag) {
			cout << "X" << endl;
		}
		else {
			cout << "Y" << endl;
		}
	}
}