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#Ruby, 28 bytes p (gets=~/^[A-Z][a-z]+$/)!=p
p (gets=~/^[A-Z][a-z]+$/)!=p
-2 bytes( thanks to manatwork )
#Ruby, 3028 bytes p (gets=~/^[A-Z][a-z]+$/)!=nil=p
#Ruby, 30 bytes p (gets=~/^[A-Z][a-z]+$/)!=nil
