#include<stdio.h>
int main()
{
    int N;
    int found = 0;
    scanf("%d",&N);
    if(N<0)
    {
        printf("Invalid Input");
    }
    int arr[N];
    for(int i=0;i<N;i++)
    {
        scanf("%d",&arr[i]);
    }
    for(int i=0;i<N;i++){
    for( int j=0;i<N;j++)
    {
        if(arr[i]==arr[j])
        {
            printf("%d ",arr[i]);
            found=1;
            break;
        }
    }
   if(!found){
    printf("No duplicates found");
   }
}