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 times, len, count = 0;
	int i, j, start, end;

	scanf("%d%d", &len, &times);
	char in[len];
	
	scanf("%s", in);

	for (i = 0; i < times; i++) {
		scanf("%d%d", &start, &end);
		for (j = 0; j < (end - start); start++) 
		{			
			if (in[start-1] == 'A') {
				if (in[start] == 'C') {
				count++;
				start + 2;
			}
				

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

	}

	return 0;

}