Problem: Arpa is taking a geometry exam. Here is the last problem of the exam.

You are given three points a, b, c.

Find a point and an angle such that if we rotate the page around the point by the angle, the new position of a is the same as the old position of b, and the new position of b is the same as the old position of c.

Arpa is doubting if the problem has a solution or not (i.e. if there exists a point and an angle satisfying the condition). Help Arpa determine if the question has a solution or not.

Input

The only line contains six integers ax, ay, bx, by, cx, cy (|ax|, |ay|, |bx|, |by|, |cx|, |cy| ≤ 109). It's guaranteed that the points are distinct.

Output

Print "Yes" if the problem has a solution, "No" otherwise.

You can print each letter in any case (upper or lower).

Examples

Input

0 1 1 1 1 0


Output

Yes


Input

1 1 0 0 1000 1000


Output

No

Note

In the first sample test, rotate the page around (0.5, 0.5) by <image>.

In the second sample test, you can't find any solution.

Solution (in PYTHON3):

Solution:
import math

def distance_square(ax, ay, bx, by):
	return (ax - bx)**2 + (ay - by)**2

def right_triangle(ax, ay, bx, by, cx, cy):
	# print(distance_square(ax, ay, cx, cy))
	# print(distance_square(ax, ay, bx, by) + distance_square(bx, by, cx, cy))
	return distance_square(ax, ay, cx, cy) == distance_square(ax, ay, bx, by) + distance_square(bx, by, cx, cy)

def triangle_area(ax, ay, bx, by, cx, cy):
	return ax * (by - cy) + bx * (cy - ay) + cx * (ay - by) != 0

coord = [int(i) for i in input().split(" ")]

ax, ay, bx, by, cx, cy = coord

if distance_square(ax, ay, bx, by) == distance_square(bx, by, cx, cy) and triangle_area(ax, ay, bx, by, cx, cy) != 0:
	print("Yes")

# Right triangle
elif distance_square(ax, ay, bx, by) == distance_square(bx, by, cx, cy) and right_triangle(ax, ay, bx, by, cx, cy):
	print("Yes")

# equilateral triangle
elif distance_square(ax, ay, bx, by) == distance_square(bx, by, cx, cy) and distance_square(bx, by, cx, cy) == distance_square(cx, cy, ax, ay) and triangle_area(ax, ay, bx, by, cx, cy) != 0:
	print("Yes")

else:
	print("No")