/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
		String a = "aaAAa";
 
		char[] chars = a.toCharArray();
 
		for (int i = 0; i < chars.length; i++) {
		    char c = chars[i];
		    if (Character.isUpperCase(c)) {
		        chars[i] = Character.toLowerCase(c);
		    } else if (Character.isLowerCase(c)) {
		        chars[i] = Character.toUpperCase(c);
		    }
		}
 
		System.out.println(new String(chars));
	}
}

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