# coding:utf-8
from collections import Counter as cc
S_before = input()
N = int(input())
S_after = input()
ans = "FAILURE"

if cc(S_before) != cc(S_after):
    ans = "SUCCESS"
else:
    if N == 0:
        if S_before != S_after:
            ans = "SUCCESS"
    if N%2 == 1:
        if S_before[1] == S_after[1]:
            ans = "SUCCESS"

print(ans)