#include<iostream>
using namespace std;
int main()
{
	int i,n,k;
	cin>>n;
	int b[0];
	b[0]=0;
	int a[i];
	
	for(i=1;i<=n;i++)
	{
		cin>>a[i];
		
		b[i]=a[i];
		
		if(b[i]%10!=b[i])
		{
			b[i]=(b[i]-b[i]%10)/10;
		}
		
		if(b[i]>b[i-1])
		{
			k=b[i-1];
			b[i-1]=b[i];
			b[i]=k;
			
			k=a[i-1];
			a[i-1]=a[i];
			a[i]=k;
		}
		else if(b[i]=b[i-1])
		{
			if(a[i]>a[i-1])
			{
				k=b[i-1];
				b[i-1]=b[i];
				b[i]=k;
				
				k=a[i-1];
				a[i-1]=a[i];
				a[i]=k;
			}
		}
	}
	
	for(i=1;i<=n;i++)
	{
		cout<<a[i];
	}
	
    return 0;	
}