def bitxor(a, b):
    if isinstance(a,int) and isinstance(b,int):
        return a ^ b
    elif isinstance(a,int) and isinstance(b,list):
        return [a ^ i for i in b]
    elif isinstance(a,list) and isinstance(b,list):
        if len(a) != len(b): return None
        else: return [a[i] ^ b[i] for i in range(0,len(a))]
    else:
        return None