#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef pair<ll,ll> P;
#define REP(i,n) for(ll i=0;i<ll(n);i++)


const double EPS=1e-12;

double f(ll x,ll y,ll x1,ll y1){
	return sqrt(1.0*(x1-x)*(x1-x)+1.0*(y1-y)*(y1-y));
}




int main(void){
	cin.tie(nullptr);  ios_base::sync_with_stdio(false);
	ll i,j;



	ll Ax,Ay,Bx,By,Cx,Cy,Dx,Dy;
	cin >> Ax >> Ay;
	cin >> Bx >> By;
	cin >> Cx >> Cy;
	cin >> Dx >> Dy;

	double AB=f(Ax,Ay,Bx,By);
	double AC=f(Ax,Ay,Cx,Cy);
	double AD=f(Ax,Ay,Dx,Dy);
	double BC=f(Bx,By,Cx,Cy);
	double BD=f(Bx,By,Dx,Dy);
	double CD=f(Cx,Cy,Dx,Dy);

	vector<double> v(3);
	v[0]=AC*BD;
	v[1]=AD*BC;
	v[2]=AB*CD;


	double s=0;
	REP(i,3) s+=v[i];
	for(i=0;i<3;i++){
		if(abs(2*v[i]-s)<EPS){
			cout << "YES" << endl;
			return 0;
		}
	}


	cout << "NO" << endl;



	return 0;
}