current_users = ['Yaroslav', 'Misha', 'Grisha', 'Masha', 'Lilya']
new_users = ['Anna', 'Misha', 'Alex', 'Masha', 'LILYA']
current_user_lower = ['yaroslav, 'misha', 'grisha', 'masha', 'lilya']
for new_user in new_users:
if new_user.lower() in current_user_lower:
print(f"{new_user}, выберите новое имя!")
else:
print(f"Пользователь {new_user} создан")