You have a text file containing 10000 lines of entries. Each entry is a product serial number followed by a description text of the product. For example: 111-22-12-2018 - this is an FMCG product 333-44-11-2018 - this is a healthcare product 999-33-10-2018 - this is a SAAS product Your task is to use regular expression techniques in Python to print the final serial number of the product by removing the product description and anything other than digits in the given entry. E. g., the final output of the above entries should be 11122122018 33344112018 99933102018 Input Format Entry of the file with product serial number and its description text.