1

#include <bits/stdc++.h>
using namespace std;
int a[50010];
int main() {
    int n;
    cin>>n;
    for(int i=1;i<=n;++i) cin>>a[i];
    sort(a+1,a+n+1);
    int m=unique(a+1,a+n+1)-a-1;
    int id=1;
    for(int i=1;i<=n;++i)
    if(i==1||a[i]!=a[i-1])
    {
    a[id]=a[i];
    ++id;
    }
    for(int i=1;i<id;++i) cout<<a[i]<<" ";
    cout<<endl;
    cout<<id-1;
    return 0;
}