S_before = input()
N = int(input())
S_after = input()

if S_before.count('o') != S_after.count('o'):
    print('SUCCESS')
    exit()

if N == 1 and (S_before, S_after) in [('oxx', 'xxo'), ('xox', 'xox'), ('xxo', 'oxx'), ('xoo', 'oox'), ('oxo', 'oxo'), ('oox', 'xoo')]:
    print('SUCCESS')
else:
    print('FAILURE')