using System;
using System.Text;
public class Test
{
public static void Main()
{
StringBuilder sb = new StringBuilder("LS2234-32342-2342-06455");
sb.Remove(18, 1);
sb.Insert(18, 'E');
Console.WriteLine(sb.ToString());
}
}
dXNpbmcgU3lzdGVtOwp1c2luZyBTeXN0ZW0uVGV4dDsKCnB1YmxpYyBjbGFzcyBUZXN0CnsKCXB1YmxpYyBzdGF0aWMgdm9pZCBNYWluKCkKCXsKCQlTdHJpbmdCdWlsZGVyIHNiID0gbmV3IFN0cmluZ0J1aWxkZXIoIkxTMjIzNC0zMjM0Mi0yMzQyLTA2NDU1Iik7CiAgICAgICAgc2IuUmVtb3ZlKDE4LCAxKTsKICAgICAgICBzYi5JbnNlcnQoMTgsICdFJyk7CiAgICAgICAgQ29uc29sZS5Xcml0ZUxpbmUoc2IuVG9TdHJpbmcoKSk7Cgl9Cn0=