import java.util.Arrays;
import java.util.Comparator;
import java.util.Scanner;

public class BiggestFormedNumber_05 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int[] numbers = Arrays.stream(scanner.nextLine().split("\\s+")).mapToInt(Integer::parseInt).toArray();
        System.out.println(largestNumber(numbers));

    }

    public static String largestNumber(int[] nums) {
        String[] arr = new String[nums.length];
        for (int i = 0; i < nums.length; i++) {
            arr[i] = String.valueOf(nums[i]);
        }

        Arrays.sort(arr, new Comparator<String>() {
            public int compare(String a, String b) {
                return (b + a).compareTo(a + b);
            }
        });

        StringBuilder sb = new StringBuilder();
        for (String s : arr) {
            sb.append(s);
        }

        while (sb.charAt(0) == '0' && sb.length() > 1)
            sb.deleteCharAt(0);

        return sb.toString();
    }
}