#include<stdio.h>
int main(){
    int n;
    scanf("%d",&n);
    
    if(n<0){
        printf("Invalid Input");
        return 0;
    }
    int arr[100],unique[100];
    int count = 0;
    
    for(int i=0; i<n;i++){
    scanf("%d",&arr[i]);
    }
    for(int i = 0; i < n; i++)
    int found = 0;
    for(int j = 0; j < count; j++){
        if(arr[i] == unique[j]){
            found = 1;
            break;
        }
    }
   if (found==0){
       unique[count] = arr[i];
       count++;
   }
}
for (int i=0; i<count; i++){
    printf("%d", unique[i]);
}
    
    return 0;
    
    
    
}