#include<stdio.h>
int main() {
    int size,i,num,top;
    scanf("%d",&size);
    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",unique[i]);
        }
        return 0;
}