from collections import OrderedDict

if __name__ == "__main__":
    N = int(input())
    WORDS = OrderedDict()
    for _ in range(N):
        WORD = input()
        if WORD in WORDS:
            WORDS[WORD] += 1
        else:
            WORDS[WORD] = 1
    print(len(WORDS))
    print(*WORDS.values())