#include <bits/stdc++.h>
using namespace std;
int main() {
  long long x1, y1, x2, y2, x3, y3;
  cin >> x1 >> y1 >> x2 >> y2 >> x3 >> y3;
  double dist_a_b =
      sqrt((double)((x1 - x2) * (x1 - x2)) + (double)((y1 - y2) * (y1 - y2)));
  double dist_b_c =
      sqrt((double)((x2 - x3) * (x2 - x3)) + (double)((y2 - y3) * (y2 - y3)));
  if (((y1 - y2) * (x1 - x3) == (y1 - y3) * (x1 - x2)) ||
      (dist_a_b != dist_b_c)) {
    cout << "No";
  } else {
    cout << "Yes";
  }
  return 0;
}
