DNA Complement

Given a DNA sequence consisting solely of the characters A, T, C, and G, your task is to compute its complementary sequence using the base pairing rules. According to the rules, the complementary bases are given by the following relations: $$A \to T, \quad T \to A, \quad C \to G, \quad G \to C.$$

The program must read a single DNA string from the standard input and output its complementary sequence to the standard output.

inputFormat

The input consists of a single line containing a non-empty DNA string. The string will only include the uppercase letters A, T, C, and G.

outputFormat

Output a single line which is the complementary DNA sequence corresponding to the input based on the following base pairing rules: $$A \to T, \quad T \to A, \quad C \to G, \quad G \to C.$$

ATCG

TAGC