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 (GCC 5.4.1) (judge verdict: Wrong Answer)

#include <stdio.h>
int main(void) {
  char s[100000];
  int a,b,i,k,n,q,j=0;

  scanf("%d",&n);
  scanf("%d",&q);

    for(i=0;i<n;i++) {
      s[i] = getchar();
    }


  for(k=0;k<q;k++) {

    scanf("%d",&a);
    scanf("%d",&b);

    for (i=a;i<=b;i++) {
        if(s[i] == 'A'||s[i++] == 'C') {
          j++;
        }
    }

    printf("%d\n", j);
    j=0;
  }

  return 0;
}