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