Description

You work for an art store that has decided to carry every style and size of drafting triangle in existence. Unfortunately, sorting these has become a problem. The manager has given you the task of organizing them. You have decided to classify them by edge length and angles. To measure each triangle, you set it on a large sheet of very accurate graph paper and record the coordinate of each point. You then run these three points through a computer program to classify the triangles according to:

Scalene

no equal sides

Isosceles

two equal sides

Equilateral

three equal sides

and Acute

all angles under 90

Right

one angle equal 90

Obtuse

one angle over 90

Of course, sometimes you make mistakes entering the data, so if you input points that do not form a valid triangle, your program should tell you.

Input

One triangle is described per line. Each line has six measurements taken to the nearest 0.001 in the order:

x1 y1 x2 y2 x3 y3 The final line of input will contain only a -1. None of the test sets contain non-right angles in the range 88-92 degrees, nor do any of the test sets include any non-equal side lengths for one triangle within 0.01 of one another.

Output

You will output one line for each triangle, which will contain two words:

< length classification > < angle classification > or Not a Triangle The final line of your output file will be: End of Output

10.000 10.000 10.000 20.000 20.000 10.000
0.000 0.000 4.000 0.000 2.000 3.464
-1

Isosceles Right
Equilateral Acute
End of Output

Source

Mid-Atlantic 2003