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- YYYY format. Find the total number of distinct years referenced in the document,
Input specification: String containing the content of the document.
Output specification: Return the total number of total specific years referenced in the document
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