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