#include<stdio.h>
int main() {
    int size,i,num,top=-1;
    scanf("%d",&size);
    if(size<0){
        printf("Invalid input");
        return 0;
    }
    int arr[size],unique[20];
    int uncount=0,found;
    for(i=0;i<size;i++) {
        scanf("%d",&num);
        arr[++top]=num;
    }
    for(i=0;i<=top;i++)
    {
        found 0;
        for(int j=0;j<=uncount;j++)
        {
            if(unique[j]==arr[i]) {
                found=1;
                break;
            }
            if(found==0){
                unique[uncount++]=arr[i];
                }
        }
        for(i=0;i<top;i++)
        {
            printf("%d\n",unique[i]);
        }
        return 0;
        }