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