View Code of Problem 43

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String chars = sc.nextLine();
        StringBuilder stringBuilder = new StringBuilder();

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