def f(test, *args):
    res = []
    for arg in args:
        if test(arg):
            res.append(arg)
    return sum(res)
data = [-4, 2, -1, 5, -6, 3]
negative = lambda x: x < 0
neg = f(negative, *data)
positive = lambda x: x > 0
pos = f(positive, *data)
print(neg, pos)

def f(transform, *args):
    res = args[0]
    for arg in args[1:]:
        res = transform(res, arg)
    return res

data = [-4, 2, -1, 5, -6, 3]
func = lambda x, n: x * (-1)**n
print(int(f(func, *data)))

def mintwo(*args):
    tmp = list(args) 
    tmp.sort()
    return tmp[0], tmp[1]
data = [8, -4, 5, -2, 9, 3, -98]
print(*mintwo(*data))

def f(*args):
    result = []
    for x in args[0]: 
        if x in result: 
            continue 
        for word in args[1:]: 
            if x not in word: 
                break 
        else: 
            result.append(x) 
    return ''.join(result)
s1, s2, s3 = "message", "massage", "mask"
print(f(s1, s2, s3))

def f(*args):
    result = []
    for x in args[0]:  
        for word in args[1:]: 
            if x not in word: 
                break 
        else: 
            result.append(x) 
    return ''.join(result)
s1, s2, s3= "message", "massage", "mask"
print(f(s1, s2, s3))

def f(*args):
    res = ""
    l = len("".join(args[:-1]))
    for i, s in enumerate("".join(args)):
        if i > l:
            res += s
    return res
s1, s2, s3= "one", "two", "three"
print(f(s1, s2, s3))

def f(*args):
    result = []
    for seq in args:
        for x in seq:
            if not x in result:
                result.append(x)
    return ''.join(result)
s1, s2, s3 = "message", "massage", "mask"
print(f(s1, s2, s3))

x = [1, 2, 3]
y = sorted(x)
y.insert(0, 100)
print(x[0])

x = [2, 1, 3]
x = x.sort()
print(x[0])

class A:
    pass
class B(A):
    pass
a = A()
b = B()
print(isinstance(b, A), isinstance(a, B))