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())
str = input()
for i in range(q):
  l,r = map(int, input().split())
  sub_str = str[(l-1):r]
  count = 0
  for j in range(len(sub_str)):
    if (sub_str[j:j+2] == 'AC'):
      count += 1
  print(count)