import extensions;

public program()
{
    var s := "0123456789";
    var n := 3;
    var m := 2;
    var c := $51;
    var z := "345";

    console.writeLine(s.Substring(n, m));
    console.writeLine(s.Substring(n, s.Length - n));
    console.writeLine(s.Substring(0, s.Length - 1));
    console.writeLine(s.Substring(s.indexOf(0, c), m));
    console.writeLine(s.Substring(s.indexOf(0, z), m))
}