#include<iostream> using namespace std; int main() { int n,a[1001]={0},s; cin>>n; for(int i=1;i<=n;i++){ cin>>s; a[s]++; } int c; for(int i=0;i<=1000;i++){ if(a[i] != 0){ cout<<i<<" "; c++; } }cout<<c; }