#include <bits/stdc++.h>
using namespace std;
long long int power(long long int a, long long int b, long long int m) {
  long long int pp = (b == 0) ? 1 : power(a, b >> 1, m);
  pp = (pp * pp) % m;
  if (b & 1) pp = (pp * a) % m;
  return pp;
}
long long int dist(long long int a, long long int b, long long int c,
                   long long int d) {
  return ((a - c) * (a - c) + (b - d) * (b - d));
}
signed main() {
  long long int a, b, c, d, e, f;
  scanf("%lld", &(a));
  scanf("%lld", &(b));
  scanf("%lld", &(c));
  scanf("%lld", &(d));
  scanf("%lld", &(e));
  scanf("%lld", &(f));
  if ((d - b) * (e - c) == (c - a) * (f - d))
    puts("No");
  else {
    if (dist(a, b, c, d) == dist(c, d, e, f))
      puts("Yes");
    else
      puts("No");
  }
  return 0;
}
