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 9.2.1) (judge verdict: Accepted)

#include <stdio.h>
//#include <string.h>

int main(void){
  /*
  char a1[2] = "A";
  char a2[2] = "T";
  char a3[2] = "G";
  char a4[2] = "C";
*/
  char a;
  scanf("%c", &a);
  
  if(a=='A') printf("T");
  else if(a=='T') printf("A");
  else if(a=='G') printf("C");
  else if(a=='C') printf("G");




  return 0;
}