Help me in solving STJ11 problem

help
,
1

My issue

the answer is correct but showing wrong answer

My code

import java.util.Scanner;
class Codechef
{
	public static void main (String[] args)
	{
		Scanner read = new Scanner(System.in);
		
		int t = read.nextInt();
		for(int i=0; i<t; i++)
		{
    		String a = read.next();
    		// Update your code below to solve this problem
    		String l="";
    		for(int j=0;j<a.length();j++){
if(a.charAt(j)=='a'){
    l=l+'z';
}
else if(a.charAt(j)=='b'){
    l=l+'y';
}
else if(a.charAt(j)=='c'){
    l=l+'x';
}
else if(a.charAt(j)=='z'){
    l=l+'a';
}
else if(a.charAt(j)=='y'){
    l=l+'b';
}
else if(a.charAt(j)=='m'){
    l=l+'n';
}
else {
    l=l+'c';
}
}
System.out.println(l);
		}
	}
}

Learning course: Placement preparation using Java
Problem Link: CodeChef: Practical coding for everyone