[Solution] Complementary Strand in a DNA CodeChef Solution

[Solution] Complementary Strand in a DNA CodeChef Solution 

You are given the sequence of Nucleotides of one strand of DNA through a string S$S$ of length N$N$. S$S$ contains the character A,T,C,$A,T,C,$ and G$G$ only.

Chef knows that:

• A$A$ is complementary to T$T$.
• T$T$ is complementary to A$A$.
• C$C$ is complementary to G$G$.
• G$G$ is complementary to C$C$.

Using the string S$S$, determine the sequence of the complementary strand of the DNA.

Input Format

• First line will contain T$T$, number of test cases. Then the test cases follow.
• First line of each test case contains an integer N$N$ - denoting the length of string S$S$.

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• Second line contains N$N$ characters denoting the string S$S$.

Output Format

For each test case, output the string containing N$N$ characters - sequence of nucleotides of the complementary strand.

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Constraints

• 1≤T≤100$1\le T\le 100$