Stream of letters

package ProgrammingBasics.WhileLoop;

import java.util.Scanner;

public class E03StreamOfLetters {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        StringBuilder word = new StringBuilder();
        boolean c = false;
        boolean o = false;
        boolean n = false;
        String input = scanner.nextLine();
        while (!input.equals("End")) {
            char letter = input.charAt(0);
            if (Character.isLetter(letter)) {
                if (letter == 'c' && !c) {
                    c = true;
                } else if (letter == 'o' && !o) {
                    o = true;
                } else if (letter == 'n' && !n) {
                    n = true;
                } else {
                    word.append(letter);
                }
            }
            input = scanner.nextLine();
            if (c && o && n) {
                System.out.print(word + " ");
                c = false;
                o = false;
                n = false;
                word = new StringBuilder();
            }
        }
    }
}