#include <iostream>

void offLineParty(short a, short b)
{
	if (b == a + 1)
	{
		std::cout << "YES" << std::endl;
	}

	else
	{
		std::cout << "NO" << std::endl;
	}

	std::cout << (unsigned)(a-b+1)<< std::endl;
}

int main()
{
	short man=0, woman=0;
	std::cin >> man;
	std::cin >> woman;
	offLineParty(man, woman);
	return 0;
}