#include <stdio.h>
 int main()
 { int n;
  //Read n
   if (scanf("%d",&n)!=1){
       printf("Inavalid input");
       return 0;
   }
   //check for negative n
    if (n<0){
         printf("Invalid input");
         return 0;
    }
    int arr[100],i,j,k;
    //Read array elements
    for (i=0;i < n;i++){
        if(scanf("%d",&arr[i]!=1){
            printf("Invalid input");
            return 0;
        }
    }
    //Remove duplicates
    for(i=0;i<n;i++){
        for(j=i+1;j<n;j++){
        if (arr[i]==arr[j]){
        if (arr[i]==arr[j]){
            //Shift elements left
            for (k=j;k<n-1;k++){
                arr[k]=arr[k + 1];
            }
           n--;
           j--;//Check again at same index
        }
        }
        }
        //print unique elements
        for(i=0;i<n;i++){
            printf("%d",arr[i]);
        }
        return 0;
    }
        }