max = int(len(data)/2) could be shortened to max = len(data) // 2 More

The part int(number / 100) can be shortened to number // 100 and I think those str(..) calls are unnecessary. As well as the check for zero input (the problem statement didn't allow zero input). But it is a nice solution, overall. More

By returning return path + mark instead of return path you add one unnecessary letter to the solution. But apart from this, very nice solution! More