using System;

public class Program

{

    public static void Main()

    {

        string str,str1,str2;

        Console.WriteLine("Input the original string : ");

        str = Console.ReadLine();

        Console.WriteLine("Input the string to be searched for :");

        str1 = Console.ReadLine();

        Console.WriteLine("Input the string to be inserted :");

        str2 = Console.ReadLine();

        int i = str.IndexOf(str1);

        str2 = " " + str2 +" ";

        str = str.Insert(i,str2);

        Console.WriteLine(str);

    }

}