# -*- coding: utf-8 -*-

from collections import Counter

s1 = input()
N = int(input())
s2 = input()

cs1 = Counter(s1)
cs2 = Counter(s2)

if cs1 != cs2:
    print('SUCCESS')
elif cs1['o'] * cs1['x'] == 0:
    print('FAILURE')
else:
    if cs1['o'] == 1 and (s1.index('o') % 2 == s2.index('o') % 2) == (N % 2):
        print('SUCCESS')
    elif cs1['x'] == 1 and (s1.index('x') % 2 == s2.index('x') % 2) == (N % 2):
        print('SUCCESS')
    else:
        print('FAILURE')