python program

Write down a program for summing up the total vehicle trip counts between a source location and destination location where each trip data has to get from the user where each trip data is in the following format: SourceLocationID-Destination Location ID Trip Counts The output must be sorted based on the Source Location ID Input Format 402-401:15 401-404:05 404-401:03 402-401:15 401-404:09 402-401:15 401-404:15 404-401:03 405-404:03 Output Format 401-404:29 402-401:45 404-401:6 405-404:3