#include<stdio.h>

void main()
{
    int n;
    int val[10];
    int seen[10];
    scanf("%d",&n);
    
    if(n<0){
        printf("-1");
    }
    else{
    for(int i=0;i<n;i++){
        scanf("%d",&val[i]);
    }
    
    for(int i=0;i<n;i++){
        if(val[i] ==seen[i-1] && i-1>=0){
        continue;
    }   seen[i]=val[i];
        
        
    }
    }
    for(int i=0;i<=n;i++)
    {if(seen[i]==0){
        continue
    }
        printf("%d ",seen[i]);
    }
}