# Create a function called say_hi
# the function takes no arguments
# the function always returns "hi"
# call the function and save its
# result in a variable called: greeting
# print greeting

def say_hi():
    x = "Hi"
    return x

print(say_hi())

# create a function called echo
# it has 1 argument called text
# the function returns the text twice (hi -> hihi)
# call the function and print its result for an example

def echo(text):
    return (text + text)

output = echo("hi")
print(output)



# subtractor
#
def subtractor(value)