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 (GCC 5.4.1) (judge verdict: Accepted)

#include<stdio.h>
int main(void){
   
    char enki[]="ATCG";
    char b;
  
    scanf("%c", &b);
    
     if(b == enki[0]) printf("%c", enki[1]);
     if(b == enki[1]) printf("%c", enki[0]);
     if(b == enki[2]) printf("%c", enki[3]);
     if(b == enki[3]) printf("%c", enki[2]);
  
   
 return 0;
}