#include<stdio.h>
int main(){
    int size,i,num,top=-1;
    scanf("%d",&size);
    if()
    int arr[size],unique[20];
    int ucount=0,found;
    for(i=0;i<size;i++){
        scanf("%d",&num);
        arr[++top]= num;
    }
    for(i=0;i<=top;i++){
        found=0;
        for(int j=0;j<ucount;j++){
            if(unique[j]==arr[i]){
                found=1;
                break;
            }}
        if(found==0)
            unique[ucount++]=arr[i];
                
        }
    
    for(i=0;i<top;i++){
    printf("%d\n",unique[i]);
    }
    return 0;
}