#include<stdio.h>
int main(){
    int n;
    int arr[100],output[100];
    int found;
    scanf("%d",&n);
    if(n<-10||n<10){
        printf("Invalid input");
        return 0;
    }
    for(int i=0;i<n;i++){
        scanf("%d",&arr[i]);
    }
    int k=0;
    for(int i=0;i<n;i++){
        found=0;
        for(int j=0;j<k;j++){
            if(output[j]==arr[i]){
                found=1;
                break;
            }
        }
        if(!found){
            output[k++]=arr[i];
        }
    }
    for(int i=0;i<k;i++){
        printf("%d",output[i]);
    }
    printf("\n");
    retur
}