8

using System;

namespace ConsoleApp5
{
    class Program
    {
        static void Main()
        {
            var words = new string[] { "zhopa", "piska", "titka", "penis" };
            string first = "";
            string last = "";
            for (int i = 0; i < words.Length; i++)
            {
                first += words[i][0];
                last += words[i][words[i].Length - 1];
            }
            Console.WriteLine(first);
            Console.WriteLine(last);
            Console.ReadKey();
        }
    }
}