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import java.util.*;

import java.lang.*;

import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */

class ComplimentToDNA

{

public static void main (String[] args) throws java.lang.Exception

{

Scanner s = new Scanner(System.in);

int t=s.nextInt();

while(t-->0)

{

int n=s.nextInt();

String str=s.next();

String ans="";

for(int i=0;i<n;i++)

{

if(str.charAt(i)=='T'){

ans+='A';

}

else if(str.charAt(i)=='A'){

ans+='T';

}

else if(str.charAt(i)=='G'){

ans+='C';

}

else{

ans+='G';

}

}

System.out.println(ans);

}

// your code goes here

}

}