using System;
using System.Console;

module Substrings
{
    Main() : void
    {
        string s = "0123456789";
        def n = 3;
        def m = 2;
        def c = '3';
        def z = "345";

        WriteLine(s.Substring(n, m));
        WriteLine(s.Substring(n, s.Length - n));
        WriteLine(s.Substring(0, s.Length - 1));
        WriteLine(s.Substring(s.IndexOf(c,0,s.Length), m));
        WriteLine(s.Substring(s.IndexOf(z, 0, s.Length), m));
    }
}