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 (Clang 3.8.0) (judge verdict: Accepted)

#include <iostream>

int main()
{
	char	str;
  	std::cin >> str;
  
  	if(str == 'A')
    {
    	printf("T");
    }
  	else if(str == 'T')
    {
  		printf("A");
    }
  	else if(str == 'C')
    {
        	printf("G");
    }
  	else
    {
    	    	printf("C");
    }
  
}