#include <iostream>
#include <string>

int main()
{
    // INPUT
    int a, b;
    std::cin >> a >> b;
    if((a+1) <= b)
    {
        std::cout << "YES" << std::endl;
        std::cout << 0 << std::endl;
    }
    else
    {
        std::cout << "NO" << std::endl;
        std::cout << (a-b+1) << std::endl;
    }
    return 0;
}