import itertools as iter
import collections as coll
import heapq as hq
import bisect as bis
from decimal import Decimal as dec
from functools import cmp_to_key
import math
import sys
#import pypyjit
#pypyjit.set_param('max_unroll_recursion=-1')
sys.setrecursionlimit(10 ** 6)
inp = sys.stdin.readline
input = lambda : inp().rstrip()
getN = lambda : int(inp())
getNs = lambda : map(int, inp().split())
getList = lambda :list(map(int, inp().split()))
getStrs = lambda n : [input() for _ in [0] * n]
def yexit(): print("Yes"); exit(0)
def nexit(): print("No"); exit(0)
pi = 3.141592653589793
mod = 1000000007
MOD = 998244353
INF = 4611686018427387903
dx = [1, 0, -1, 0];	dy = [0, 1, 0, -1]


"""
Main Code
"""

ans = []
for _ in [0] * getN():
	s = input()
	t = input()
	ma = max(len(s), len(t))
	mi = min(len(s), len(t))
	lis1 = [s] * ((ma - 1) // len(s) + 1);	ss = ''.join(lis1)
	lis2 = [t] * ((ma - 1) // len(t) + 1);	tt = ''.join(lis2)
	if(ss[:ma] == tt[:ma]):
		if(len(s) == ma):
			ans.append('X')
		else:
			ans.append('Y')
		continue
	if(ss > tt):
		ans.append('X')
	else:
		ans.append('Y')

for c in ans:
	print(c)