using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine(substrPos("practice", "geeksforgeeks"));

    }

    public static int substrPos(string sub, string source)

    {

        int subLen = sub.Length;

        int sourceLen = source.Length;

        for (int i = 0; i <= sourceLen - subLen; i++) 

        {

            int j;

            for (j = 0; j < subLen; j++)

            {

                if (source[i + j] != sub[j])

                {

                    break;

                }

            }

            if (j == subLen)

            {

                return i;

            }

        }

        return -1;

    }

}