Chef and Balls

Surprisingly, the Chef found today’s Codeathon problems slightly difficult, so he came up with an easy one. Chef has come across a bag of balls containing different coloured balls. The bag has n balls of the following colors: Black($B$), White($W$), Red($R$), Green($G$) and Pink($P$). Chef decides to empty the bag and aligns all the balls in a row next to each other and begins to play with them o