#include <iostream>
 #include <iomanip>
 #include <cmath>
 #include <algorithm>
 #include <cstdlib>
 #include <limits.h>
 #include <string>

 #define ll long long

 using namespace std;
 void Fast_IO();
 void Rofyda_Elghadban(){
   #ifndef ONLINE_JUDGE
        freopen("input.txt", "r", stdin), freopen("output.txt", "w", stdout);
    #endif
}



int main()
 {   Rofyda_Elghadban();
 //Fast_IO();
 //freopen("input.txt","r",stdin);
 //freopen("output.txt","r",stdout);
 ll x1,y1,x2,y2,x3,y3,x4,y4,res1,res2,res3,res4;
 cin>>x1>>y1>>x2>>y2>>x3>>y3>>x4>>y4;
 res1=x2-x1;
 res2=y2-y1;
 res3=x4-x3;
 res4=y4-y3;
 if((res2/res1)==(res4/res3)){
  cout<<"YES"<<endl;
 }else{
  cout<<"NO"<<endl;
 }

 return 0;
 }