import sys
input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
#######################################################################
n = ni()
from math import gcd
for _ in range(n):
    x = input()
    y = input()
    g = gcd(len(x),len(y))
    ok = 1
    for i in range(g):
        for j in range(len(x)//g):
            if x[i] != x[i + g * j]:
                ok = 0
                break
        for j in range(len(y)//g):
            if x[i] != y[i + g * j]:
                ok = 0
                break
        if ok^1:
            break
    if ok:
        if len(x) < len(y):
            print("Y")
        else:
            print("X")
    else:
        ans = ""
        i = 0
        while True:
            if x[i%len(x)] < y[i%len(y)]:
                ans = "Y"
                break
            elif x[i%len(x)] > y[i%len(y)]:
                ans = "X"
                break
            i += 1
        print(ans)