user_0 = {
    'username': 'efermi',
    'first': 'enrico',
    'last': 'fermi'
}
for key, value in user_0.items():
    print("Key: " + key)
    print("Value: " + value)

favorite_languages = {
    'jen': 'python',
    'sarah': 'c',
    'edward': 'ruby',
    'phil': 'python'
}
for name in favorite_languages.keys():
    print(name.title())

print("The following languages have been mentioned:")
for language in favorite_languages.values():
    print(language.title())
print('/n')
for language in set(favorite_languages.values()):
    print(language.title())
