N=int(input())
result=0
for i in range(N):
    text=input()
    known_word=[]
    for word in text:
        flag=True
        if word not in known_word:
            known_word.append(word)
            present_word=word
        else:
            if word!=present_word:
                flag=False
                break
    if flag==True:
        result=result+1
print(result)