Задача J. Король

#include <iostream>
#include <fstream>
#include <cmath>
#include <math.h>


using namespace std;

int a, b, c, d;

int main(int argc, const char * argv[]) {
    cin >> a >> b >> c >> d;
    if(a + 1 == c || b + 1 == d){
    	if(a <= 8 || b <= 8){
    	cout << "YES";
    }
    }
    else{
    	cout << "NO";
    }
}