using System;

public class Program

{

    public static void Main()

    {

        int n, r, ld = 0;

        int a, b = 0 ;

        int q,q1,q2 = 0;

        Console.Write("Enter a number:");

        n = Convert.ToInt32(Console.ReadLine());

        if(n < 0){

            n=n*(-1);

        }

        a = Convert.ToInt32(Console.ReadLine());

        if(a < 0){

            a=a*(-1);

        }

        b = Convert.ToInt32(Console.ReadLine());

        if(b < 0){

            b=b*(-1);

        }

        int[] arr = new int[3];

​

        while (n > 0)

        {

            r = n % 10;

            if (ld < r)

            {

                ld = r;

            }

            n = n / 10;

        }

        //Console.WriteLine("Largest digit:" + ld);

        q = ld;

        r=0; ld = 0;

        while (a > 0)

        {

            r = a % 10;

            if (ld < r)

            {

                ld = r;

            }

            a = a / 10;

        }

        //Console.WriteLine("Largest digit:" + ld);

        q1 = ld;

        r=0; ld = 0;

        while (b > 0)

        {

            r = b % 10;

            if (ld < r)

            {

                ld = r;

            }

            b = b / 10;

        }

        //Console.WriteLine("Largest digit:" + ld);

        q2=ld;

        arr[0] = q; arr[1] = q1; arr[2] = q2;

        Array.Sort(arr, (y, x) => y.CompareTo(x));

        foreach (var item in arr) {

            Console.Write(item);

            }

    }

}