#include <iostream> #include <cstdio> using namespace std; int main() { int n,i,t; int a[20010] = {0}; scanf ("%d",&n); for(i = 0; i < n; i++) { scanf("%d",&t); if(a[t] == 1) continue; else { a[t] = 1; printf("%d ",t); } } cout <<endl; return 0 ; }