#!/usr/bin/env python
#coding:utf8

def read():
    return list(raw_input()), input(), list(raw_input())


def work((S, N, T)):
    if S.count('o') != T.count('o') or S.count('x') != T.count('x'):
        print "SUCCESS"
        return

    cost = 0
    for i in range(len(S)):
        for j in range(i + 1, len(S)):
            if S[i] != T[i] and S[j] != T[j]:
                cost = abs(i - j)
    
    if cost > N or (N - cost) % 2 == 1:
        print "SUCCESS"
    else:
        print "FAILURE"


if __name__ == "__main__":
    work(read())