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>
#include<string.h>
int main(void)
{
  char str[0];
  scanf("%s",str);
  
  if(strcmp(str,"A")==0){printf("T");}
  if(strcmp(str,"T")==0){printf("A");}
  if(strcmp(str,"C")==0){printf("G");}
  if(strcmp(str,"G")==0){printf("C");}
  
  return 0;
}