http://codeforces.com/problemset/problem/59/A Problem - 59A - Codeforces codeforces.com Vasya is very upset that many people on the Net mix uppercase and lowercase letters in one word. That's why he decided to invent an extension for his favorite browser that would change the letters' register in every word so that it either only consisted of lowercase letters or, vice versa, only of uppercase o..