PLEASE COMPLETE THE THREE EXERCISES USING PYTHON 3.8

Exercise 1 Complete exercise 1 from Section 10.15 of the textbook. Write a function called mestedswww that takes a list of lists of integers and adds up the elements from all of the nested lists. For example: >>> t = [[1, 2], [3], [4, 5, 6]] >>> nested sum(t) 21 Exercise 2 Write a function called count matches that takes a list of strings, and outputs the number where the string length is 2 or more, and the first and last character of the string match each other. Sample List : ['abc, 'xyz, aba', '1221] Expected Result : 2 Exercise 3 Write a function that implements the Sieve of Eratosthenes e to find all the prime numbers between 1 and a given number n. Prime numbers