#include<bits/stdc++.h>
using namespace std;
#define file(filename) freopen(filename".in","r",stdin),freopen(filename".out","w",stdout)
#define endl "\n"
#define INF 0x3f3f3f3f
#define ll long long
#define ull unsigned long long
#define mem(a,num) memset(a,num,sizeof(a))
#define keep(n) fixed<<setprecision(n)
#define lowbit(x) x&(-x)
#define pch putchar
#define LF putchar('\n')
#define SP putchar(' ')
template <typename T>void read(T& x) {x = 0; char ch = getchar();ll f = 1;while (!isdigit(ch)) {if (ch == '-')f *= -1;ch = getchar();} while (isdigit(ch)) {x = x * 10 + ch - 48;ch = getchar();}x *= f;}template <typename T, typename... Args>void read(T& first, Args&... args) {read(first);read(args...);}template <typename T>void write(T arg) {T x = arg;if (x < 0) {putchar('-');x = -x;}if (x > 9) { write(x / 10);} putchar(x % 10 + '0');}template <typename T, typename... Ts>void write(T arg, Ts... args) {write(arg); if (sizeof...(args) != 0) { putchar(' ');write(args...);}}


const ll N=100001;
int n,m,sum,ans;
int a[N];
set<int> s;
int main() {
  //file("");
  //ios::sync_with_stdio(false), cin.tie(0), cout.tie(0);
  read(n);
  for(int i=1;i<=n;i++){
      read(m);
      s.insert(m);
  }for(auto iter=s.begin();iter!=s.end();++iter) write(*iter);
  return 0;
}