5 lines
142 B
Python
5 lines
142 B
Python
def f(k):
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a,b,c=*map(int,k[0].split('-')),k[1][0]
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return (k[2][a-1]==c)^(k[2][b-1]==c)
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print(sum(f(x.split()) for x in open("/dev/stdin")))
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