// editor1
#include<stdio.h>
int main(){
    int n;
    scanf("%d",&n);
    if (n<0){
        printf("Invalid input\n");
        return 0;
    }
    int arr[20];
    int unique[20];
    int i,j,k=0;
    int isduplicate;
    for (i=0;i<n;i++){
        scanf("%d",&arr[i]);
    }
    for (i=0;i<n;i++){
        isduplicate = 0;
        for (j=0;j<k;j++){
            if (arr[i] == unique[j]){
                isduplicate = 1;
                break;
            }
        }
        if (!isduplicate){
            unique[k++]=arr[i];
        }
    }
    for (i=0;i<k;i++){
        printf("%d", unique[i]);
    }
    printf("\n";);
    return 0;
}