def solve(x, y):
    assert x != y
    l = min(len(x), len(y))
    if x[:l] < y[:l]:
        return 'Y'
    elif x[:l] > y[:l]:
        return 'X'
    if x * 100 < y * 100:
        return 'Y'
    else:
        return 'X'
        
for _ in range(int(input())):
    x = input()
    y = input()
    print(solve(x, y))