Problem:
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

Solution in C++14 (GCC 5.4.1) (judge verdict: Accepted)

#include<bits/stdc++.h>
#define MAXN 1e6
using namespace std;

int main()
{
	//freopen("t.txt","r",stdin);
	char c;
	cin>>c;
	if( c=='A')cout<<"T";
	if( c=='C')cout<<"G";
	if( c=='G')cout<<"C";
	if( c=='T')cout<<"A";
	
}