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: Wrong Answer)

#include<stdio.h>
int main(void)
{
  char s[10];
  
  int a,b,c;
  int result=0, max=0;
 
  scanf("%s",&s);
  for(a=0;a<10;a++)
  {
    if((s[a]=='A')||(s[a]=='T')||(s[a]=='C')||(s[a]=='G'))
         result++;
    else
       {
         if(max < result)
           max = result;
         result=0;
       }
   }
  printf("%d",max);
   return 0;
}