$3.$ Suppose three numbers $\backslash ($ A$,$ B $\backslash ),$ and $\backslash ($ C $\backslash )$ are given in ascending order representing the lengths of the sides of a triangle. The problem is to determine the type of the triangle $($whether it is isosceles, equilateral, right, obtuse, or acute$).$ Consider the following program written for this problem:

Read $($a$,$ b$,$ c$)$;

if $\backslash (($a