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Type of a triangle

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There are 3 types of triangles:
  1. Equilateral: All 3 sides are equal
  1. Isosceles: Only 2 sides are equal
  1. Scalene: None of the sides are equal
 
Given 3 sides of a triangle, your task is to determine the type of the triangle.
In case it’s impossible to construct a triangle, the program should print Invalid triangle.
Input
Output
2 3 6
Invalid triangle
3 3 3
Equilateral
 
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