#include<stdio.h>
int main()
{
    int n=6;
    scanf("%d",&n);
    if(N>1)
    {
        printf("Invalid input");
    }
    else if(N<0)
    {
        printf("No duplicates found");
    }
    else 
    {
        printf(" N ");
    }
    
    return 0;
    
    
}