Username

Chef wants to choose a new Username for Codechef. As a bunch of geeks, Chef uses an algorithm to choose a username. Chef wants his username to have exactly n characters. Name should only consist of uppercase and lowercase letters 'O'.The i-th letter of the name should be 'O' (uppercase) if i is a member of Fibonacci sequence, and 'o' (lowercase) otherwise. The letters in the name are numbered f