gosti = ["DIma", "Kira", "Petya"]
text = '. Приходите в гости!'

message1 =  gosti[0].title() + text

message2 =  gosti[1].title() + text

message4 =  gosti[2].title() + text

too_expensive = 'Petya'

print('\n ' + message1 + '\n ' + message2 + '\n ' + message4 + '\n ' )

print('К сожалению ' + too_expensive + ' прийти не сможет.')

gosti.append('nikita')

message3 =  gosti[3].title() + text

print('\n ' + message1 + '\n ' + message2 + '\n ' + message3)
# your code goes here

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