Writing Analysis Chart V1

import java.util.Scanner;

class Main {

  public static void main (String[] args) {
    Scanner scan = new Scanner(System.in);

    String str = scan.nextLine();

    String firstFour = "";
    int wordCount = 1;
    int sentenceNum = 1;
    int i = 0;
    int st = 0;
    while (i < str.length()) {
      char c = str.charAt(i);
      if (c == '.') {
        System.out.println(sentenceNum + ": " + firstFour + " || " + wordCount);
        wordCount = 0;
        sentenceNum++;
        st = i+2;
      } else if (c == ' ') {
        wordCount++;
        if (wordCount == 5) {
          firstFour = str.substring(st, i);
        }
      }
      i++;
    }

  }

}