Q.3
#include<bits/stdc++.h>
using namespace std;
int main(){
int x1, y1, x, y;
cin >> x1 >> y1 >> x >> y;
int xdiff = abs(x-x1);
int ydiff = abs(y-y1);
if(x == x1 || y == y1)cout << "YES" << endl;
else if(xdiff == ydiff)cout << "YES" << endl;
else cout << "NO" << endl;
return 0;
}