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Score : $100$ points

### Problem Statement

On the Planet AtCoder, there are four types of bases: A, C, G and T. A bonds with T, and C bonds with G.

You are given a letter $b$ as input, which is A, C, G or T. Write a program that prints the letter representing the base that bonds with the base $b$.

### Constraints

• $b$ is one of the letters A, C, G and T.

### Input

Input is given from Standard Input in the following format:

$b$

### Output

Print the letter representing the base that bonds with the base $b$.

A

T

G

C