#include <bits/stdc++.h>
#include <atcoder/all>
using mint = atcoder::static_modint<998244353>;
//using mint = atcoder::static_modint<1000000007>;
using namespace std;
using namespace atcoder;
using ld = long double;
using ll = long long;
#define mp(a,b) make_pair(a,b)
#define rep(i,s,n) for(int i=s; i<n; i++)
const vector<int> dx{1,0,-1,0},dy{0,1,0,-1};

ll inner(pair<ll,ll>x,pair<ll,ll>y,pair<ll,ll>z){
    return (x.first-z.first)*(y.first-z.first)+(x.second-z.second)*(y.second-z.second);
}
ll d(pair<ll,ll>x,pair<ll,ll>y){
    return (x.first-y.first)*(x.first-y.first)+(x.second-y.second)*(x.second-y.second);
}
int main(){
    vector<pair<ll,ll>> A(4);
    for(auto&[x,y]:A)cin >> x >> y;
    ll l=inner(A[0],A[1],A[2]);
    ll r=inner(A[0],A[1],A[3]);
    l*=l,r*=r;
    l*=d(A[0],A[3]);
    l*=d(A[1],A[3]);
    r*=d(A[0],A[2]);
    r*=d(A[1],A[2]);
    if(l==r)cout << "YES";
    else cout << "NO";
}