import java.util.*;
 
/*
プログラミングのお題スレ Part12 
ttps://mevius.5ch.net/test/read.cgi/tech/1538096947/614
 
614 名前：デフォルトの名無しさん[sage] 投稿日：2018/11/21(水) 21:03:37.61 ID:Gj+ctZjI
お題
N個の正整数を並べ替えたあと結合してできる整数の最小値を求めよ
 
3 2 1
=> 123
 
1 2 21
=> 1212
 
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
=> 10111121314151623456789
*/
class Ideone
{
    public static void main(String[] args)
    {
        try (Scanner in = new Scanner(System.in))
        {
            while(in.hasNextLine())
            {
                String[] strs = in.nextLine().split(" ");
                Arrays.sort(strs, (x, y) -> (x + y).compareTo(y + x));
                for (String s : strs) System.out.print(s);
                System.out.println();
            }
        }
    }
}

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MyAyIDEKMSAyIDIxCjEgMiAzIDQgNSA2IDcgOCA5IDEwIDExIDEyIDEzIDE0IDE1IDE2CjEwIDExIDEwMSAxMDAKMTAxIDEwCjEwIDEwMQ==

3 2 1
1 2 21
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
10 11 101 100
101 10
10 101