Complementary Strand in a DNA

You are given the sequence of Nucleotides of one strand of DNA through a string $S$ of length $N$. $S$ contains the character $A, T, C,$ and $G$ only. Chef knows that: - $A$ is complementary to $T$. - $T$ is complementary to $A$. - $C$ is complementary to $G$. - $G$ is complementary to $C$. Using the string $S$, determine the sequence of the complementary strand of the DNA. ### Input - First li