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