num = input()
words1 = input()
words2 = input()

words1_list = list(words1)
words2_list = list(words2)

for word in words_list1:
    if word in words2:
        pass
    else:
        num = words1_list.index(words)
        print(str(num))
        print(words1_list[num])
        print(words2_list[num])