import sys
input = lambda: sys.stdin.readline().rstrip()
ii = lambda: int(input())
mi = lambda: map(int, input().split())
li = lambda: list(mi())
INF = 2 ** 63 - 1
mod = 998244353

def solve():
    s = input()
    t = input()
    ans = 'X'
    if len(s) > len(t):
        p = 1
        while len(s) > p * len(t):
            p += 1
        t = t * p
    else:
        ans = 'Y'
        p = 1
        while len(t) > p * len(s):
            p += 1
        s = s * p
    for i in range(min(len(s), len(t))):
        if s[i] > t[i]:
            ans = 'X'
            break
        elif s[i] < t[i]:
            ans = 'Y'
            break
    print(ans)

for _ in range(ii()):
    solve()