Write a program that calculates longest substring of increasing letters in st, say st=Supercalifragilisticexpialidocious. Do it in a few steps:

Find longest increasing substring starting from 0th position, use comparison <= to check if one letter greater than other

Use function len of object str(ing) to find length of string,

Write one line of code that choses longest string from 2

Loop through all possible starting position start of the str, and find longest increasing substring of st

The question need to be run in python