# 2 kinds of funmctions
"""
Library -> print(), input()

userdefine -> make your own need
"""
def add(a,b):
    sum = a+b
    print(sum)
def sub(x,y):
    sub = x-y
    print(sub)
add(10,15)
sub(15,7)
def message():
    print("No parameter")
message()
