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 (Clang 3.8.0) (judge verdict: Wrong Answer)

#include <stdio.h>
int main(void){
	char a='A',t='T',c='C',g='G';
  	char m;
  	scanf("%c\n",&m);
  	if(m==a)m=t;
  	if(m==t)m=a;
  	if(m==c)m=g;
  	if(m==g)m=c;
  	printf("%c\n",m);
  	return 0;
}