using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        Console.WriteLine(FindIndex(new string[] {"hi", "edabit", "fgh", "abc"}, "fgh"));

    }

    public static int FindIndex(string[] arr, string str) 

    {

        int i = 0;

            foreach(var item in arr)

            {

                i++;

                if(item.Contains(str))

                {

                    i--;

                    break;

                }

            }

        return i;

    }

}