#include <stdio.h>
int main(){
    int n;
    if(scanf("%d", &n)!=1) return 0;
    if (n<0){
        printf("Invalid Input");
        return 0;
    }
    int stack[1000];
    int top = -1;
    
    for (int i=0;i<n;i++){
        int x;
        scanf("%d", &x);
        stack[++top] = x;
    }
    int unique[1000];
    int uTop=-1;
    
    
    for(int i=0;i<=top;i++){
        int present = 0;
        for(int j=0;j<=uTop; j++){
            if(unique[j] == stack[i]){
                present = 1;
                break;
            }
        }
        if (!present){
            unique[++utop] = stack[i];
        }
    }
    
    for(int i=0;i<=uTop; i++){
        printf("%d\n", unique[i]);
    }
    return 0;
}