class ForLoop {
  public String s1;

  public void printFirstThree(String s1) {
    System.out.println(s1.substring(0,3));
  }

  public void printAllSubstrings() {
    int len = s1.length();
    System.out.println("");
    // i indicates length of substring
    // j indicates starting index of substring
    for(int i = 1; i <= len; i++) {
      for(int j = 0; j <= len-i; j++) {
	System.out.println(s1.substring(j, j+i));
      }
    }
  } // End printAllSubstrings()

  public void printAllSubstrings1() {
    int len = s1.length();
    System.out.println("");
    // i indicates starting index of substring
    // j indicates ending index (+1) of substring
    for(int i = 0; i <= len-1; i++) {
      for(int j = 0; j <= len; j++) {
	if(j <= i) { continue; }
	System.out.println(s1.substring(i, j));
      }
    }
  } // End printAllSubstrings1()

  public static void main(String[] args) {
    ForLoop t1 = new ForLoop();
    t1.s1 = "abc";
    System.out.println(t1.s1);
    t1.printAllSubstrings();
    t1.printAllSubstrings1();
  }
}