101220: [AtCoder]ABC122 A - Double Helix

Memory Limit：256 MB Time Limit：2 S
Judge Style：Text Compare Creator：
Submit：0 Solved：0

Description

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 $b$.

Sample Input 1

A

Sample Output 1

T

Sample Input 2

G

Sample Output 2

C

Input

题意翻译

在 AtCoder 星球上，有四种类型的基数：`A`，`C`，`G` 和 `T`。`A` 与 `T` 结合，`C` 与 `G` 结合。 您会得到一个字母 $b$ 作为输入，它是 `A`，`C`，`G` 或者 `T`。编写一个程序，打印代表与 $b$ 结合的字母。

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