#include <iostream>
using namespace std;

int a, b, i, j, gasit;
void citire()
{
    cout << "a= ";cin >> a;
    cout << "b= ";cin >> b;
}
void numere_prime()
{
    for(i=a;i<=b;i++)
    {
        gasit = 0;
        if((i%2==0)&&(i!=2)) gasit = 1;
        else
        {
            for(j=3;j<=i/2;j+=2)
            {
                if(i%j==0) gasit = 1;
            }
        }
        if(gasit==0) cout << i << " ";
    }
}
int main()
{
    citire();
    numere_prime();
    return 0;
}