#include<stdio.h>
int main(){
    int num,i,size,top=-1;
    scanf("%d",&size;)
    for(i=0;i<size;i++){
        printf("%d",&size);
        return 0;
    }
    int arr[size];
    for(i=0;i<num;i++){
            scanf("%d",&num);

        arr[++top]=num;
    }
    int unique[size] ,ucount=0;
    for(i=0;i<top;i++){
        int found  = 0;
    for(j=0;j<ucount;j++){
        if(unique[i]=arr[j]){
        found = 1;
    }
    }
    if(found==0){
      unique[count++] = arr[i];  
    }
    }
    for(i=0;i<ucount;i++){
       printf("%d",unique[i]); 
    }
    return 0;
}