Venkat And His Commute

Venkat commutes on a 2D plane in order to reach his office. He can go either up or right. He thinks that his current route is too long and he wants to make it as short as possible. You are given a sequence of Venkat's moves. In the given sequence moving up is described by character $U$ and moving right is described by character $R$. Venkat can replace any pair of consecutive moves $RU$ or $UR$ wi