using System;

using System.Text;

public class Program

{

    public static void Main()

    {

        Encoding ascii = Encoding.ASCII;

         string text = Console.ReadLine();

        byte[]arr = ascii.GetBytes(text);

        int p = 3;

        int q = 7;

        int n = p * q;

        int f = (p - 1) * (q -1);

        Random r = new Random();

        int t = r.Next(2,f);

        for(int e = 2; e<t; e++)

        {

            if(gcd(e,t) == 1)

            {

                break;

            }

        }

        int res = gcd(60,48);

        string s = ascii.GetString(res);

        Console.WriteLine(s);

    }

    public static int ModPow(int m, int e, int n)

    {

        int x = Convert.ToInt32(Math.Pow(m,e) % n);

        return x;

    }

    public static byte[] Encryption(byte[] arr,int e, int n)

    {

        byte[]res = new byte[arr.Length];

        for(int i = 0; i<arr.Length; i++)

        {

            res[i] = Convert.ToByte(Math.Pow(arr[i],e) % n);

        }

    return res;

    }

    public static int gcd(int a, int b)

    {

        int res = 0;

        if(b == 0)

        {

            res = a;

        }

        else

        {

            res = gcd(b,a%b);

        }

        return res;

    }

}