Which Triangle
By Alexandre A. Melo, IFSC 
Brazil
By Alexandre A. Melo, IFSC Brazil
Given three values, find out if they form a triangle. If so, check if the triangle is scalene, isoceles or equilateral and if it is a triangle rectangle or not.
Input is given by three integers A,B e C (0 < A,B,C < 105).
The output must be the one single line containing the string "Invalido" if the input values do not represent a triangle.
If the values can be the sides of a triangle the output must be "Valido-Equilatero" if such triangle is equilateral, "Valido-Escaleno" if it is scalene or "Valido-Isoceles" if it is isoceles. The next line of output must read "Retangulo: S" if the triangle is rectangle or "Retangulo: N" otherwise, as shown in the examples.
| Input Samples | Output Samples |
|
4 6 2 |
Invalido |
|
4 3 3 |
Valido-Isoceles |
|
3 4 5 |
Valido-Escaleno |