import sys
input = sys.stdin.readline


def subsolve(X, Y):
    lx = len(X)
    ly = len(Y)
    res = ["X", "Y"]
    if lx > ly:
        res = ["Y", "X"]
        X, Y = Y, X
        lx, ly = ly, lx

    for i in range(2*ly):
        x = X[i%lx] 
        y = Y[i%ly]
        if x > y:
            return res[0]
        elif y > x:
            return res[1]
    
    if lx > ly:
        return res[0]
    if ly > lx:
        return res[1]



Q = int(input())
for _ in range(Q):
    X = list(input().rstrip())
    Y = list(input().rstrip())
    print(subsolve(X, Y))