#include<stdio.h>
int main{
    int n;
    scanf("%d",&n);
    if (n < 0){
        printf("invalid input\n");
        return 0;
    }
    int arr[10],unique[10],i,j,k=0;
    for (i = 0;i < n; i++){
        scanf("%d", &arr[i]);
    }
    
    for (i = 0; i < n; i++){
        int duplicate = 0;
        for (j = 0;j < k; j++){
            if (arr[i] == unquie[j]){
                duplicate = 1;
                break;
            } 
            
        }
        if(!duplicate) {
            unique[k++] = arr[i];
        }
    }
    
    for (i = 0;i < k; i++){
        printf("%d",unique[i]);
    }
    return 0;
}