Username generator.

Usernames.java

import java.util.*;

public class Usernames {

     public static void main(String[] args) {
        
        // Declare variables
        Scanner sc = new Scanner(System.in);
        String first, last, username;
        
        // Get input
        first = sc.next();
        last = sc.next();
        
        // Create random generator
        Random generator = new Random();
        int randomNumber = generator.nextInt(90) + 10;
        
        // Generate username
        username = first.charAt(0) + last.substring(0, 5) + randomNumber;
        System.out.println(username);
     }
}

fghd