# Python has many built-in functions, and if you do not know how to use it,
# you can read document online or find some books. But Python has a built-in document
# function for every built-in functions.
# Please write a program to print some Python built-in functions documents,
# such as abs(), int(), raw_input()
# And add document for your own function


print("abs", abs.__doc__, "\n")
print("int", int.__int__, "\n")
print("str", str.__doc__, "\n")
print("float", float.__doc__, "\n")
