AT_abc477_a [ABC477A] Traffic Light

The color of a certain traffic light changes periodically in the order `B` (blue), `Y` (yellow), `R` (red), `B` (blue), `Y` (yellow), `R` (red), $ \dots $ . You are given a character $ c $ representing the current color of the traffic light. Output the next color of the traffic light.

The input is given from Standard Input in the following format: > $ c $

Output the character representing the next color of the traffic light.

### Sample Explanation 1 The color after `B` (blue) is `Y` (yellow). Thus, output `Y`. ### Sample Explanation 2 The color after red is blue. ### Constraints - $ c $ is one of `B`, `Y`, and `R`.