17 lines
293 B
Python
17 lines
293 B
Python
import sys
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input = sys.stdin.readline
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n = int(input())
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cnt = n
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for _ in range(n) :
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word = input()
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for i in range(len(word)-1) :
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if word[i] == word[i+1] :
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pass
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elif word[i] in word[i+1:] :
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cnt -= 1
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break
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print(cnt)
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