AT_scpc2026_div3_a Find the Missing Letter

Description

#### 表示言語 / / flakepym was typing the string `SCSC` on his computer and accidentally omitted one character. Find the missing character.

Input Format

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

Output Format

Output the omitted character as an uppercase letter.

Explanation/Hint

### Constraints - The string $ S $ has length $ 3 $ and consists only of the uppercase letters `S` and `C`. - The given string can be obtained by removing exactly one character from `SCSC`.