s_before = gets.chomp
n = gets.to_i
s_after = gets.chomp

before_o = s_before.count('o')
after_o = s_after.count('o')

if before_o != after_o
  puts :SUCCESS
elsif n == 0
  puts s_before == s_after ? :FAILUE : :SUCCESS
elsif n == 1
  d = s_before.dup
  d[0], d[1] = d[1], d[0]
  s_before[0], s_before[1] = s_before[1], s_before[0]
  puts(d == s_after || s_before == s_after ? :FAILUE : :SUCCESS)
else
  puts :FAILUE
end