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