#include <fstream>
#include <iostream>
using namespace std;
ifstream input("patrate.in");
ofstream output("patrate.out");

int main()
{
    int a,b,nr_elm = 0;

    input>>a>>b;

    for(int i = a; i <= b;i++)
    {
        int n = i;
        int p = 0,ok = 1;

        while(n > 1 && ok == 1)
        {
            for(int d=2;d <= n && ok != 0;d++)
            {
                while(n % d == 0)
                {
                    p++;
                    n /= d;
                }

                if(p % 2 == 1)
                    ok = 0;
            }
        }
        if(ok)
            nr_elm++;
    }

    cout<<nr_elm<<endl;


    for(int i = a; i <= b;i++)
    {
        int n = i;
        int p = 0,ok = 1;

        while(n > 1 && ok == 1)
        {
            for(int d=2;d <= n && ok != 0;d++)
            {
                while(n % d == 0)
                {
                    p++;
                    n /= d;
                }

                if(p % 2 == 1)
                    ok = 0;
            }
        }
        if(ok)
            cout<<i<<" ";
    }
}