'''
Exercise 40: Name that Triangle
A triangle can be classified based on the lengths of its sides as equilateral, isosceles
or scalene. All 3 sides of an equilateral triangle have the same length. An isosceles
triangle has two sides that are the same length, and a third side that is a different
length. If all of the sides have different lengths then the triangle is scalene.
Write a program that reads the lengths of 3 sides of a triangle from the user.
Display a message indicating the type of the triangle.
'''

s1 = float(input('Enter the length of the first side: '))
s2 = float(input('Enter the length of the second side: '))
s3 = float(input('Enter the length of the third side: '))

if s1 == s2 == s3:
    print('That\'s an Equilateral Triangle')
elif s1 == s2 or s1 == s3 or s2 == s3:
    print('That\'s an Isosceles Triangle')
else:
    print('That\'s an Obtuse triangle')