In what concerns the continuous evaluation solving exercises grade during the semester, you should submit until 23:59 of March 10th
(this exercise will still be available for submission after that deadline, but without couting towards your grade)
[to understand the context of this problem, you should read the class #02 exercise sheet]

[PII014] Triangle Trouble

Little Emma is in trouble and she needs your help to solve her math homework. She needs to find the type a triangle:

• The triangle is equilateral if all sides are equal;
• The triangle is isosceles if two sides are equal;
• The triangle is scalene if none of its sides are equal.

The Problem

Write a program that, given the lengths of three sides of a triangle, indicates its type: equilateral, isosceles or scalene.

Input

The input consists of one line containing three integers A, B and C, the lengths of the sides of a triangle.

Output

The output should be a single line displaying "equilateral" (if all sides are equal), "isosceles" (two sides are equal) or "scalene" (no sides are equal).

Constraints

The following limits are guaranteed in all the test cases that will be given to your program:

42 42 42

equilateral

23 47 23

isosceles

4 7 2

scalene