Write a program that takes a positive integer as the height of the triangle and prints an alphabetical triangle, using lowercase English letters as shown below. Each subsequent row of the triangle should increase in length by two letters. Make sure your program validates the user input. If the user does not input a positive integer, print "Invalid input."

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Variables and Constant

Constants and variables are widely used in mathematical equations and expressions. They are also commonly found in the domain of programming, where each language has its own way to differentiate between a constant and a variable. Since they have all sorts of applications, knowing their differences is a good place to start.