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