static betterCIComparator_es_C betterCIComparator_es_instance;

static betterCIComparator_es_C betterCIComparator_es() {

  if (betterCIComparator_es_instance == null)

    betterCIComparator_es_instance = new betterCIComparator_es_C;

  ret betterCIComparator_es_instance;

}

sclass betterCIComparator_es_C implements Comparator<ES> {

  public int compare(ES e1, ES e2) {

    S s1 = getVar(e1), s2 = getVar(e2);

    if (s1 == null) ret s2 == null ? 0 : -1;

    if (s2 == null) ret 1;

    int n1 = s1.length();

    int n2 = s2.length();

    int min = Math.min(n1, n2);

    for (int i = 0; i < min; i++) {

        char c1 = s1.charAt(i);

        char c2 = s2.charAt(i);

        if (c1 != c2) {

            c1 = Character.toUpperCase(c1);

            c2 = Character.toUpperCase(c2);

            if (c1 != c2) {

                c1 = Character.toLowerCase(c1);

                c2 = Character.toLowerCase(c2);

                if (c1 != c2) {

                    // No overflow because of numeric promotion

                    return c1 - c2;

                }

            }

        }

    }

    return n1 - n2;

  }

}