Wuestion # 1 Revisit How to attempt? Question Documents The United Nations Organization released an official document regarding the most important events from the beginning of time (dated 00-00-0000) with a brief description of the events. The date of all the events is mentioned in the "DD-MM- format. Find the total number of distinct years referenced in the document. Input Specification: input1: String containing the content of the document Output Specification: Return the total number of distinct years referenced in the document. can't find proper code