Note:For those submitting in Java, don't use Scanner class for taking inputs. Instead copy the code from here: https://ideone.com/OlFPpz and use this class for taking inputs. This works exactly the same way as Scanner.
You are given T tasks. For each task you are required to find the total time the task took given starting time S and the ending time E.
In the first line, you are given an integer T , the number of test cases. Each test case contains E (Ending Time) and S (Starting Time) in HH:MM format in a single line.
For each test case print a single line representing the time required for the task in the format HH:MM. If answer is 5 hours you have to print it as 05:00.