#include<stdio.h>
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;
}