#include <iostream>

bool isPrime(int num) {
    if (num < 2) {
        return false;
    }
    
    for (int i = 2; i * i <= num; ++i) {
        if (num % i == 0) {
            return false;
        }
    }
    
    return true;
}

int main() {
    int m, n;
    std::cin >> m >> n;
    
    int count = 0;
    for (int i = m; i <= n; ++i) {
        if (isPrime(i)) {
            std::cout << i << " ";
            count++;
        }
    }
    
    std::cout << std::endl << count << std::endl;
    
    return 0;
}