#include <iostream>
#include <string>

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