using System.Collections.Generic;
public static void Main()
string input = Console.ReadLine();
Char[] charin = input.ToCharArray();
List<char> charlist = new List<char>();
charlist.AddRange(charin);
int length = charlist.Count;
for (int j = 0; j < length; j++)
if (charlist.IndexOf(searching) != -1)
Console.Write("not iso");