human
Give me a the Python program you requested given the following:
I am working on the file "Abducted!.ipynb".
The first task is:
Functions do not implement the multiplication method right out of the gate, i.e. if you have two functions, don't expect to compose them into a new function with the multiplication operator, unless and until you have the right Composer class.
Lets use the @ operator (__matmul__) instead of __mul__ (*).  We need to accept a non-composer on the left i.e. the object implementing the method may be to the right of its argument.  That's where __rmatmul__ comes in.  
Both functions and Composer type objects are directly callable, so expressions like self(x) and other(x) should always make sense.
Can you write Python program for it?
assistant
#Here is the Python program you requested.

class Composer:
    """allow function objects to chain together"""
    
    def __init__(self, func):
        self.func = func  # swallow a function
        
    def __matmul__(self, other):
        return Composer(lambda x: self(other(x)))
    
    def __rmatmul__(self, other):
        return Composer(lambda x: other(self(x)))
        
    def __call__(self, x):
        return self.func(x)

def addA(s):
    return s + "A"

def addB(s):
    return s + "B"

result = addA(addA(addA("K")))  # ordinary composition
print(result)

result = addB(addA(addB("K")))
print(result)