#include <iostream>
using namespace std;
int main(int argc, char **argv){
    int low, high;
    cin >> low >> high;
    
        for(int i=low; i<=high; i++)
        {
            int flag=0;
            for(int j=2; j*j<=i; j++)
            {
                if(i%j==0)
                {
                    flag=1;
                    break;
                }
            }
            if(flag==0)
            {
                cout<<i<<"\n";
            }
        }
        return 0;
}