#include <iostream>
#include<cstdio>

long long  v[500000];
int n;

void afisare()
{
	for (int i=0;i<n;i++)
	{ printf("%d",v[i]);

	}
}

int sortare(int n)
{int aux;
	for (int i=0;i<n;i++)
		for (int j=i+1;j<n;j++)
		{
			if(v[i]>v[j])
			{
				aux=v[i];
				v[i]=v[j];
				v[j]=aux;

			}
		}
	return 0;
}



int main()
{
freopen("combinari.in","r",stdin);
freopen("combinari.out","w",stdout);


	scanf("%d",&n);


for (int i=0;i<n;i++)
{
	scanf("%d",&v[i]);
}

sortare(n);
afisare();


return 0;
}