# Using the variable below, print "Hello, world!".
# greeting = "Hello, world"
# You can add the missing exclamation mark using string concatenation, format, or f-strings. The choice is yours.

greeting = "Hello, world"
print(greeting + "!")

greeting = "Hello, world{}"
print(greeting.format("!"))

greeting = "Hello, world{}".format("!")
print(greeting)

greeting = "Hello, world"
print(f"{greeting}!")

greeting = "Hello, world"
print(greeting + "!")
