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 all[10];
	int a,cnt=0,max=0;
	scanf("%s",all);
	for(a=0;a<10;a++){
		if(all[a]=='A'){
			cnt++;
			if(a==9){
				if(max<cnt){
					max=cnt;
				}
			}
		}
		else if(all[a]=='T'){
			cnt++;
			if(a==9){
				if(max<cnt){
					max=cnt;
				}
			}
		}
		else if(all[a]=='G'){
			cnt++;
			if(a==9){
				if(max<cnt){
					max=cnt;
				}
			}
		}
		else if(all[a]=='C'){
			cnt++;
			if(a==9){
				if(max<cnt){
					max=cnt;
				}
			}
		}
		else{
			if(max<cnt){
				max=cnt;
				cnt=0;
			}else{
				cnt=0;
			}
		}
	}
	printf("%d",max);
return 0;
}