#include <bits/stdc++.h>
using namespace std;
#include <atcoder/all>
using namespace atcoder;
using ll = long long;
using vi = vector<int>;
using vvi = vector<vector<int>>;
using pii = pair<int, int>;
#define rep(i, n) for (int i = 0; i < (int)(n); ++i)
#define repr(i, n) for (int i = (int)(n - 1); i >= 0; --i)

struct MP {
    const string word;

    MP(const string &W) : word(W), table(W.size() + 1) {
        table[0] = -1;
        for (int i = 0, j = -1; i < W.size(); i++) {
            while (j >= 0 && W[i] != W[j]) j = table[j];
            ++j;
            table[i + 1] = j;
        }
        return;
    }

    vi searchIn(const string &S) {
        int n = S.size();
        vi ret(n);
        int m = 0, k = 0;
        while (m + k < S.size()) {
            if (S[m + k] == word[k]) {
                k++;
                if (k == word.size()) {
                    ret[m] = k;
                    m = m + k - table[k];
                    k = table[k];
                }
            } else {
                ret[m] = k;
                m = m + k - table[k];
                if (k > 0) k = table[k];
            }
        }
        return ret;
    }

   private:
    vi table;
};

int solve() {
    string x, y;
    cin >> x >> y;
    int r = 0;
    if (x.size() > y.size()) {
        swap(x, y);
        r = 1;
    }
    MP sv(x);
    vi res = sv.searchIn(y + y);
    int nx = x.size(), ny = y.size();
    int c = 0;
    while (1) {
        if (res[c] < nx) {
            int k = res[c];
            if (x[k] > y[(c + k) % ny]) r ^= 1;
            return r;
        }
        c = (c + nx) % ny;
        if (c == 0) break;
    }
    return r;
}
int main() {
    int T;
    cin >> T;
    rep(i, T) cout << (solve() ? 'X' : 'Y') << '\n';
    return 0;
}