using System;
using System.Text;
using static System.Convert;
public class Test
{
public static void Main()
{
const string input = "thi";
var encoded = ToBase64String(Encoding.UTF8.GetBytes(input));
Console.WriteLine(encoded);
var decoded = Encoding.UTF8.GetString(FromBase64String(encoded));
Console.WriteLine(decoded);
}
}
dXNpbmcgU3lzdGVtOwp1c2luZyBTeXN0ZW0uVGV4dDsKdXNpbmcgc3RhdGljIFN5c3RlbS5Db252ZXJ0OwoKcHVibGljIGNsYXNzIFRlc3QKewoJcHVibGljIHN0YXRpYyB2b2lkIE1haW4oKQoJewoJCWNvbnN0IHN0cmluZyBpbnB1dCA9ICJ0aGkiOwoJCXZhciBlbmNvZGVkID0gVG9CYXNlNjRTdHJpbmcoRW5jb2RpbmcuVVRGOC5HZXRCeXRlcyhpbnB1dCkpOwoJCUNvbnNvbGUuV3JpdGVMaW5lKGVuY29kZWQpOwoJCXZhciBkZWNvZGVkID0gRW5jb2RpbmcuVVRGOC5HZXRTdHJpbmcoRnJvbUJhc2U2NFN0cmluZyhlbmNvZGVkKSk7CgkJQ29uc29sZS5Xcml0ZUxpbmUoZGVjb2RlZCk7Cgl9Cn0=