using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    private static Dictionary<char, int> preComputed = new Dictionary<char, int> ();

    public static void Main()

    {

        var result = SquareDigits(9119);

        Console.WriteLine(result);

    }

    private static string SquareDigits(uint input)

    {

        return string.Join(string.Empty, input.ToString().Select(x => Square(x)));

    }

    private static int Square(char  x) {

        if (preComputed.ContainsKey(x))

        {

            return preComputed[x];

        }

        var numberX = Int32.Parse(x.ToString());

        var squared = numberX* numberX;

        preComputed[x] = squared;

        return squared;

    }

}