#include<stdio.h>
int main(){
    int n,gopi[101],akash[101];
    scanf("%d",&n);
    if(n<1){
        printf("Invalid input");
        goto end;
    }
    for(int i=0;i<n; i++){
        scanf("%d",&gopi[i]);
    }
    for (int i = 0; i < n; i++) {
        int cheat = 0;
        for (int j = 0; j < i; j++) {
            if (gopi[i] == gopi[j]) {
                cheat = 1;  
                break;
            }
if (!cheat){
    printf("%d",gopi[i])
}
}
}
end:
;
}