#include<stdio.h>
#define MAX_ROLLS 10
#define MAX_TYPE 10
int main()
{
    int N;
    if(scanf("%d",&N)!=1)
    {
        printf("Invalid input");
        return 0;
    }
    if(N<0)
    {
        printf("Invalid input");
        return 0;
    }
    int unique_rolls[MAX_ROLLS];
    int top=0;
    int seen[2*MAX_TYPE+1]={0};
    int roll_type;
    int i;
    for(i=0;i<N;i++)
    {
        if(scanf("%d",&roll_type)!=1)
      {
          break;
      }
      int check_index=roll_type+MAX_TYPE;
      if(check_index<0 || check_index>=(2*MAX_TYPE+1))
      {
          continue;
      }
      if(seen[check_index]==0)
      {
          seen[check_index]=1;
          if(top<MAX_ROLLS)
          {
              unique_rolls[top]=roll_type;
              top++;
          }
      }
    }
    for(i=0;i<top;i++)
    {
        printf("%d\n",unique_rools[i]);
    }
    return 0;
}