// Convert uppercase to lowercase and vice-versa.
import java.util.Scanner;
class test {
public static void main(String ar[]) {

	Scanner sc=new Scanner(System.in);
	System.out.println("Enter any string:");
	String name = sc.nextLine();
	String ans="";
	// extract each character from user_id by charAt() method.
	for(int i=0;i<name.length();i++)
	{
		char ch = name.charAt(i); // get the 0th character, 1st character and so on..
		if(Character.isUpperCase(ch))  // if character is uppercase, convert to lowercase and append in the final ans.
		{
			ans = ans + Character.toLowerCase(ch);
    	}
		else
		{
			ans = ans + Character.toUpperCase(ch);  // vice-versa

		}
	}
	System.out.println("Converted String: "+ans);
}
}

/* OUTPUT:
Enter any string:
Java Programming
Converted String: jAVA pROGRAMMING
*/