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>
#include <stdlib.h>
#include <string.h>


int main(void)
{
	char b[10]; 
	int i = 0,max = 0,coun = 0;
	scanf("%s",&b);
	for(i = 0;i < strlen(b)+1;i++)
	{
		if(b[i] == 'A'||b[i] == 'C'||b[i] == 'G'||b[i] == 'T')
		coun++;
		else{
			if(coun > max){
				max = coun;
				coun = 0;
			}
			}
		}
		printf("%d\n",max);
	return 0;
}