#include <stdio.h>
int main() {
    int n;
    scanf("%d", &n);
    if (n < 0) {
        printf("Invalid input");
        return 0;
    }
    int arr[n];
    int freq[10000]={0};
    int dummy=1000;
    for (int i=0;i<n;i++) {
        scanf("%d",&arr[i]);
        if(arr[i]<0){
            printf("Invalid input");
            return 0;
        } 
    }
    for (int i=0; i<n;i++) {
        freq[arr[i]+dummy]++;
            }
    for (int i=0; i<10000;i++) 
    {
        if(freq[arr[i]+dummy]>0) {
        printf("%d ",arr[i]);
        freq[arr[i]+offset]=0;
        }
}
}