Description

Enter the three sides of a triangle, first determine whether they can form a triangle, and then determine the type of the triangle (equilateral?, isosceles?, general?).

Input Format

If the sides cannot form a triangle, output no.
For an equilateral triangle, output db; for an isosceles triangle, output dy; for a general triangle, output yb.

Output Format

Output one line: whether it is a triangle or the type of the triangle.

1 1 1

db

Hint

Conditions to determine a triangle: The sum of any two sides must be greater than the third side, and the difference of any two sides must be less than the third side.