100 atcoder#ABC122A. [ABC122A] Double Helix
[ABC122A] Double Helix
Score : 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 as input, which is A
, C
, G
or T
. Write a program that prints the letter representing the base that bonds with the base .
Constraints
- is one of the letters
A
,C
,G
andT
.
Input
Input is given from Standard Input in the following format:
Output
Print the letter representing the base that bonds with the base .
A
T
G
C