def length(myList):
    myLength = 0
    for x in myList:
        myLength = myLength + 1
    return myLength

brothers = ['Mike', 'Joe', 'Ty']
sisters = ['Lena', 'Gina']

print("There are " + str(length(brothers)) + " brothers.")
print("There are " + str(length(sisters)) + " sisters.")