Stream Of Letters

package WhileLoop;

import java.util.Scanner;

public class StreamOfLetters {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String secretWords = "" ;
        int cLetterCount = 0;
        int oLetterCount = 0;
        int nLetterCount = 0;
        int secretWordCount = 0;
        boolean firstLetter = false;
        String safeWord = scanner.nextLine();
        while (!safeWord.equals("End")) {
            char letters = safeWord.charAt(0);
            if ((letters >= 'a' && letters <= 'z') || (letters >= 'A' && letters <= 'Z')) {
                if (letters == 'c' && cLetterCount < 1) {
                    cLetterCount++;
                    secretWordCount++;
                    firstLetter = true;
                }else if (letters == 'o' && oLetterCount < 1) {
                    oLetterCount++;
                    secretWordCount++;
                    firstLetter = true;
                }else if (letters == 'n' && nLetterCount <1) {
                    nLetterCount++;
                    secretWordCount++;
                    firstLetter = true;
                }
                if (secretWordCount == 3) {
                    System.out.printf("%s ",secretWords);
                    secretWordCount = 0;
                    nLetterCount = 0;
                    oLetterCount = 0;
                    cLetterCount = 0;
                    secretWords = "";
                }else if (!firstLetter) {
                    secretWords += letters;
                }
                firstLetter = false;
            }
            safeWord = scanner.nextLine();
        }
        if (safeWord == "End" && secretWordCount == 3) {
            System.out.printf("%s ",safeWord);
        }
    }
}