5 lines
158 B
Python
5 lines
158 B
Python
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def chk(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(chk(x.split()) for x in open("/dev/stdin").readlines()))
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