python language, working with nested lists and nested loops

Part I: Student Grade Alert (20 points) In this part, you will write a function student-alert ()The function simulates a simplified student grade alert system, which will evaluate a list of students' grades, and return their corresponding "alert level" (more on this later). The function takes only one argument, student s, which is a list of lists. Each sub-list contains one particular student's grades in the form of letter grade strings. Each letter grade has a corresponding integer value as shown below: Letter Grade Corresponding Value 95 85 75 1) Example list: [l'A', 'B,'A,',B'1, ['A', 'F'l, ['F,'C, D', 'A','A', ['F,'F'1