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.

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.

Constraints

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

Sample Input 1

A

Sample Output 1

T

Sample Input 2

G

Sample Output 2

C

见题面 Input 部分

见题面 Output 部分