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 Python (3.4.3) (judge verdict: Runtime Error)

N, Q = map(int, input().split())
S = input()
LR = [list(map(int, input().split())) for _ in range(Q)]

t = [0] * (N+1)
for i in range(N):
    t[i+1] = t[i] + (1 if S[i: i+2] == 'AC' else 0)
ans = [t[LR[i][1] - 1] - t[LR[i][0] - 1] for i in range(Q)]    

print(*ans, sep='\n')