Write a function that accepts a string and returns the counts of the number of upper case letters and lower case letters in the string (A letter is uppercase, if letter.isupper() is true and it is lower case if letter.islower() is true) code example

world = input()
upper,lower = 0,0

for i in world:
    upper+=i.isupper()
    lower+=i.islower()

print("UPPER CASE {0}\nLOWER CASE {1}".format(upper,lower))