#include<stdio.h>
int main(){
    int n;
    scanf("%d",&n);
    if(n<0 || n>10){
        printf("Invalid input");
        return 0;
    }
    int rolls[n],unique[n],top=-1;
    int seen[100]={0};
    for(int i=0;i<n;i++){
        scanf("%d",&rolls[i]);
    }
    for(int i=o;i<n;i++){
        int val=rolls[i];
        int index=val+50;
        if(seen [index]==0){
            seen[index]=1;
            top++;
            unique[top]=val;
        }
    }
    for(int i=0;i<=top;i++){
        printf("%d\n",unique[i]);
    }
    return 0;
}