Consider this simplified handler chain code snippet:

Consider this simplified handler chain code snippet:

class Handler:
    def __init__(self, successor=None):
        self.successor = successor
    def handle(self, request):
        if self.can_handle(request):
            return f"Handled {request}"
        elif self.successor:
            return self.successor.handle(request)
        else:
            return "Not handled"
    def can_handle(self, request):
        return False

class ConcreteHandlerA(Handler):
    def can_handle(self, request):
        return request == 'A'

class ConcreteHandlerB(Handler):
    def can_handle(self, request):
        return request == 'B'

chain = ConcreteHandlerA(ConcreteHandlerB())
print(chain.handle('B'))

What is the output of this code?