public class Program {
public static void Main() {
string inPut;
string result = "";
while ((inPut = System.Console.ReadLine()) != null) {
string[] num = System.Console.ReadLine().Split(" ");
//对字符串进行冒泡排序,规则是B+A大于A+B,则认为B>A,将B与A交换位置
for (int i = 0; i < num.Length - 1; i++) {
//如果某一轮没有发生比较 说明这个字符串数组已经有序了
bool outflag = false;
for (int j = 0; j < num.Length - 1 - i; j++) {
//如果j+1比j大,则交换位置
string str1 = num[j + 1] + num[j];
string str2 = num[j] + num[j + 1];
if (string.Compare(str1, str2) == 1) {
string tmp = num[j];
num[j] = num[j + 1];
num[j + 1] = tmp;
outflag = true;
}
}
if (!outflag)
break;
}
//记录输出结果
for (int j = 0; j < num.Length; j++)
result += num[j];
//换行
result += "\n";
}
System.Console.WriteLine(result);
}
}