#include<stdio.h>
int main()
int n;
scanf("%d",&n);
if(n<0){
    printf("Invalid input\n");
    return 0;
}
int seen[100001]={0};
for(int i=0;i<n;i++){
    int roll;
    scanf("%d",&roll);
    if(!seen[roll]){
        printf("%d",roll);
        seen[roll]=1;
    }
}
printf("\n");
return 0;
}