#include <iostream>

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