## https://yukicoder.me/problems/no/2030

H = 9999999999999937
B = 30

def solve(X, Y):
    if len(X) == len(Y):
        for i in range(len(X)):
            if X[i] != Y[i]:
                if X[i] < Y[i]:
                    return "Y"
                else:
                    return "X"
    else:
        reverse = False
        # len(X) < len(Y)として問題を解きたい
        if len(X) > len(Y):
            X, Y = Y, X
            reverse = True

        # ローリングハッシュ
        pow_b = [0] * (len(Y) + 1)
        b = 1
        for i in range(len(Y) + 1):
            pow_b[i] = b
            b *= B
            b %= H
        
        hash_x = 0
        for x in X:
            hash_x *= B
            hash_x %= H
            hash_x += ord(x) - ord("a") + 1
            hash_x %= H
        
        array = [0] * (2 * len(Y))
        hash_y = 0
        for i in range(2 * len(Y)):
            hash_y *= B
            hash_y %= H
            hash_y += ord(Y[i % len(Y)]) - ord("a") +  1
            hash_y %= H
            array[i] = hash_y

        index = 0
        passed = [False] * len(Y)
        target = -1
        while not passed[index % len(Y)]:
            passed[index % len(Y)] = True

            ind = index % len(Y)

            hash_y = array[ind + len(X) - 1] if ind == 0 else (array[ind + len(X) - 1] - ((array[ind - 1] * pow_b[len(X)]) % H)) % H
            if hash_x != hash_y:
                target = index
                break
            index += len(X)
        
        if target == -1:
            ans = "Y"
        else:
            ind = target % len(Y)
            for i in range(len(X)):
                if X[i] > Y[(i + ind) % len(Y)]:
                    ans = "X"
                    break
                elif X[i] < Y[(i + ind) % len(Y)]:
                    ans = "Y"
                    break

        if reverse:
            if ans == "X":
                return "Y"
            else:
                return "X"
        else:
            return ans


def main():
    T = int(input())
    answers = []
    for _ in range(T):
        X = input()
        Y = input()
        ans = solve(X, Y)
        answers.append(ans)
    for ans in answers:
        print(ans)


if __name__ == '__main__':
    main()