A - Double Helix

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