백준_1316번_그룹단어체커

n = int(input())

a = list()

for i in range(n):

    word = input()

    a.append(word)

non_sequence = 0

non_word = 0

for i in range(n):

    non_sequence = 0

    word_length = len(a[i])

    for j in range(word_length):

        temp = a[i][j]

        temp_i = j

        for k in range(j+1, word_length):

            if a[i][k] == temp and k - temp_i == 1:

                temp_i = k

            elif a[i][k] == temp and temp_i - k != 1:

                non_sequence = non_sequence + 1

                break

    if non_sequence >= 1 :

        non_word = non_word + 1

print(n - non_word)