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hackerrank.com Matrix Script Problem Link : https://www.hackerrank.com/challenges/matrix-script/problem Difficulty : Hard Tip MUST remove __main__, it lead to fail even correct answer, because there is 'if' Should use regular expression Lookahead and lookbehind Write regular expression, to capture [alphabet][symboles][alphabet] Solution #!/bin/python3 import math import os import random import r..