лаба

from math import ceil


def to_encrypt_6(s, key): #прямая изгородь
    answer = [''] * key
    dir = 1
    cur = 0
    for e in s:
        answer[cur] += e
        cur += dir
        if cur == 0 or cur == key - 1:
            dir *= -1
    return ''.join(answer)


def to_encrypt_7(s, key): #обратная изгородь
    answer = [''] * key
    dir = -1
    cur = key - 1
    for e in s:
        answer[cur] += e
        cur += dir
        if cur == 0 or cur == key - 1:
            dir *= -1
    return ''.join(answer)


def to_encrypt_8(s, key): #перестановочная прямая
    key = sorted([(key[i], i) for i in range(len(key))])
    answ = ''
    mx = []
    for i in range(0, len(s), len(key)):
        mx.append(s[i:i + len(key)])
    for e in mx:
        for ind in key:
            if ind[1] < len(e):
                answ += e[ind[1]]
    return answ


def to_encrypt_9(s, key): #перестановочная обратная
    key = sorted([(key[i], i) for i in range(len(key))])
    mx = [''] * ceil(len(s) / len(key))
    cur = len(mx) - 1
    for i in range(0, len(s), len(key)):
        mx[cur] = s[i:i + len(key)][::-1]
        if len(mx[cur]) < len(key):
            mx[cur] = '0' * (len(key) - len(mx[cur])) + mx[cur]
        cur -= 1
    answ = ''
    for e in mx:
        for ind in key:
            if e[ind[1]] != '0':
                answ += e[ind[1]]
    return answ


def to_encrypt_10(s, key): #redefence прямой
    answer = [''] * len(key)
    dir = 1
    cur = 0
    for e in s:
        answer[cur] += e
        cur += dir
        if cur == 0 or cur == len(key) - 1:
            dir *= -1
    key = sorted([(key[i], i) for i in range(len(key))])
    redefence = ''
    for e in key:
        redefence += answer[e[1]]
    return redefence


def to_encrypt_11(s, key): #redefence обратный
    answer = [''] * len(key)
    dir = -1
    cur = len(key) - 1
    for e in s:
        answer[cur] += e
        cur += dir
        if cur == 0 or cur == len(key) - 1:
            dir *= -1
    key = sorted([(key[i], i) for i in range(len(key))])
    redefence = ''
    for e in key:
        redefence += answer[e[1]]
    return redefence


print(to_encrypt_6('изгородь', 3))
print(to_encrypt_7('изгородь', 3))
print(to_encrypt_8('перестановка', 'слово'))
print(to_encrypt_9('перестановка', 'слово'))
print(to_encrypt_10('изгородь', 'сон'))
print(to_encrypt_11('изгородь', 'сон'))