#include <stdio.h>

int top = -1;
int arr[25];

void push(int num){
    if(top == -1)
    {
        arr[++top] = num;
        return;
    }
    for(int i=0;i<top+1;i++){
        if(arr[i] == num){
            return;
        }
        arr[++top] = num;
        return;
    }
}

int main(){
    int size,i,num;
    scanf("%d",&size);
    for(i=0;i<size;i++){
        scanf("%d",&num);
        push(num);
    }
    display();
}