#include <iostream>
#include <vector>

using namespace std;
vector<bool> prime;

void catcher(int n)
{
    prime = vector<bool>(n+1, true);
    prime[0] = prime[1] = false;
    for (int i=2; i*i<=n; ++i)
        if (prime[i])
            for (int j=i*i; j<=n; j+=i)
                prime[j] = false;
}

int main(int argc, char **argv)
{
    int a, b;
    cin>>a>>b;
    catcher(b);
    b--;
    while(!prime[b])b--;
    for(int i=a+1;i<b;i++)
        if(prime[i])
            cout<<i<<",";
    cout<<b;
}