Write a Python program that reads from each line of an input file called grades.txt, a student id followed by the student grades in 3 exams. The program will then calculate the average of the student...

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Extracted text: Write a Python program that reads from each line of an input file called grades.txt, a student id followed by the student grades in 3 exams. The program will then calculate the average of the student and save in a file called results.txt the student id followed by the calculated average. For example, if the grades.txt contains sii1 60 60 90 S222 89.5 90 89 S333 42 50 43 The file results.txt will contain si11: 70.00 S222: 89.50 S333: 45.00