write a function called first day greater that takes two lists, l1 and l2, representing the daily measured weights of rat 1 and rat 2, respectively, and returns the index of the first day for which the weight for the first rat is greater than the weight of the second rat. if there are no such days then the function should return -1. you may not assume that l1 and l2 are the same length. use the following to test your program:
