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){
  int i, j = 0, d = 0;
  int ATC_COUNT[10] = {0,0,0,0,0,0,0,0,0,0};
  char STRING[10];
  scanf("%s", STRING);
  for(i=0; i<=10; i++){
    if(STRING[i] == 'A' || STRING[i] == 'G' || STRING[i] == 'C' || STRING[i] == 'T') {
      ATC_COUNT[i] = 1;
    }
  }
  printf("%d",ATC_COUNT[1]);
  for(i=0; i<=10; i++) {
  	if(ATC_COUNT[i] == 1){
  		j++;
  	}
  	if(j >= d){
  		d = j;
  	}
  	if(ATC_COUNT[i] == 0){
  		j = 0;
  	}
  }
	printf("%d",d);
  return 0;
}