View Code of Problem 43

import java.util.Scanner;


public class Main {
    public static void main(String[] args) {
        Scanner scanner=new Scanner(System.in);
        StringBuilder s=new StringBuilder(scanner.next());
        StringBuilder result = new StringBuilder(100);

        for (int i = 0; i < s.length(); i++) {
            char letter = s.charAt(i);
            if ((letter >= 'a' && letter <= 'z') || (letter >= 'A' && letter <= 'Z')) {
                result.append(letter);
            }
        }
        System.out.println(result);
    }
}