You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
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def f(d,e,f):
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a,b=*map(int,d.split('-'))
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return (f[a-1]==e[0])^(f[b-1]==e[0])
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print(sum(f(*x.split())for x in open(0)))
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