#include <stdio.h>
int main()
{
    int n;
    scanf("%d",&n);
    if(n<1)
    {
        printf("Invalid input");
    }
    else if(n < -1000 || n > 1000)
    {
        for (int i = 0 ; i < n ; i++ )
        scanf("%d",&arr[n]);
        if(arr[0] == arr[0+1])
        {
            int a = 10;
            int b = 20;
            printf("%d%d", a,b);
        }
        else
        {
            printf(" No duplicates found");
        }
    }
}