22 lines
351 B
Python
22 lines
351 B
Python
n = int(input())
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cnt = 0
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for _ in range(n):
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chk = set()
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s = input()
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prev = None
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flag = True
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for ch in s:
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if ch != prev :
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if ch in chk:
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flag = False
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break
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if prev is not None:
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chk.add(prev)
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prev = ch
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if flag : cnt+=1
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print(cnt)
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