#include <iostream>
#include <cstdio>
#include <stdio.h>

using namespace std;

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

    long long n,a[10000],aux,j,i;
    cin>>n;
    for(i=1;i<=n;i++)
        cin>>a[i];
    for(i=1;i<=n-1;i++)
        for(j=i+1;j<=n;j++)
            if(a[i]>a[j])
            {
                aux=a[i];
                a[i]=a[j];
                a[j]=aux;
            }
    for(i=1;i<=n;i++) cout<<a[i];


    return 0;
}