#!/usr/bin/env python3

class A:
    def x(self):
        return ["A"]


class BMix(A):
    def x(self):
        return super().x() + ["B"]


class CMix(A):
    def x(self):
        return super().x() + ["C"]


class D(A):
    def x(self):
        return super().x() + ["D"]


class E(CMix, D, BMix):
    def x(self):
        return super().x() + ["E"]


print(E().x())