current_users = ['YarosLav', 'MiSha', 'GrishA', 'MAsha', 'LilyA']
current_users = [user.lower() for user in current_users]
new_users = ['Anna', 'Misha', 'Alex', 'Masha', 'Lilya']
for user in new_users:
if user.lower() in current_users:
print('Имя занято')
else:
print('Имя свободно')