using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

​

namespace pin1

{

    class Program

    {

        public int minimum(int input1, int input2, int input3)

            {

            int rem, min, rem1, rem2;

            rem=input1 % 10;

             min=rem;

             rem1=input2%10;

            if(rem1<min)

            {

            min = rem1;

            }

            rem2=input3%10;

            if(rem2<min)

            {

            min = rem2;

            }

         return min;

           }

        public int maximum(int input1,int input2,int input3)

        {

            int max1, rem1=maxi(input1) ,rem2=maxi(input2),rem3=maxi(input3);

​

            int maxi(int input)

            {

                int max=0, rem;

                while (input > 0)

                {

                    rem = input % 10;

                    if (rem > max)

                    {

                        max = rem;

                    }

                    input /= 10;

                }

                return max;

            }

​

            if (rem1 > rem2 && rem1 > rem3)

                max1 = rem1;

            else if (rem2 > rem1 && rem2 > rem3)

                max1 = rem2;

            else

                max1 = rem3;

​

            return max1;

        }

    public static void Main(string[] args)

        {

            int num1 = Convert.ToInt32(Console.ReadLine());

            int num2 = Convert.ToInt32(Console.ReadLine());

            int num3 = Convert.ToInt32(Console.ReadLine());

            Program p = new Program();

            int[] pin = new int[4];

            pin[3]=p.minimum(num1, num2, num3);

            pin[2] = p.minimum(num1/10, num2/10, num3/10);

            pin[1] = p.minimum(num1/100, num2/100, num3/100);

            pin[0] = p.maximum(num1, num2, num3);

            for (int i = 0; i < 4; i++)

                Console.Write(pin[i]);

        }

    }

    }

​