using System;
public class Test
{
public static void Main()
{
string abcd = "asdsdasdasdasdasdasasdasasdssXsdasdsadas";
Console.WriteLine(abcd.Substring(abcd.IndexOf("X") - 10, 10));
}
}
dXNpbmcgU3lzdGVtOwoKcHVibGljIGNsYXNzIFRlc3QKewoJcHVibGljIHN0YXRpYyB2b2lkIE1haW4oKQoJewoJCXN0cmluZyBhYmNkID0gImFzZHNkYXNkYXNkYXNkYXNkYXNhc2Rhc2FzZHNzWHNkYXNkc2FkYXMiOwogICAgICAgICAgICAgICAgQ29uc29sZS5Xcml0ZUxpbmUoYWJjZC5TdWJzdHJpbmcoYWJjZC5JbmRleE9mKCJYIikgLSAxMCwgMTApKTsKCX0KfQ==