#include <stdio.h>
int main(){
    scanf("%d", &n);
    if(n < 0){
        printf("Invalid input");
        return 0;
    }
    int arr[100], result[100];
    int i,j,k = 0, dup;
    for (i = 0; i < n; i++){
        scanf("%d", &arr[i]);
    }
    for (i = 0;i < n;i++){
        dup = 0;
        for (j = 0;j < k;j++){
            if(arr[i] == result[j]){
                dup = 1;
                break;
            }
        }
        if (!dup){
            result[k++] = arr[i];
        }
    }
    for (i = 0;i < k;i++){
        printf("%d",result[i]);
    }
    return 0;
}