language = {'python': 3, 'php': 5, 'java': 6, 'c++': 9}
keys = language.keys()
values = language.values()
print(keys)
print(len(keys))
print(values)
print(len(values))
'''
run:
dict_keys(['php', 'java', 'c++', 'python'])
4
dict_values([5, 6, 9, 3])
4
'''