from random import choice
from copy import copy
import os

letters = ['а','б','в','г','д','е','ж','з','и','й','к','л','м','н','о','п','р','с','т','у','ф','х','ц','ч','ш','щ','ъ','ы','ь','э','ю','я',' ']

def generate_key():
    file = open("key.txt","a+")
    dup = copy(letters)
    for i in range(len(letters)):
        random_letter = choice(dup)
        file.write(letters[i] + random_letter + '\n')
        dup.remove(random_letter)
    file.close()
    return

def read_key():
    file = open("key.txt", "r")
    keys = file.read().split('\n')[:-1]
    return dict((key[0], key[1]) for key in keys)

def encryption():
    filename = input()
    keys = read_key()
    text = open(filename, "r").read()
    r = []
    for i in range(len(text.strip())):
        if text[i].lower() in letters:
            r.append(keys[text[i].lower()])
        else:
            r.append(text[i])

    text = "".join(r)
    file = open("encrypted.txt","w+")
    file.write(text)
    file.close()

def get_key(val, my_dict):
    for key, value in my_dict.items():
         if val == value:
             return key


    return val

def decrypt():
    filename = input()
    if os.path.exists(filename):
        text = open(filename).read()
        keys = read_key()
        r = []
        for i in range(len(text.strip())):
            r.append(get_key(text[i], keys))
        text = "".join(r)
        print(text)
        file = open("decrypted.txt","w+")
        file.write(text)
        file.close()
    else:
        print("No encrypt file")

def main():
    command = input()
    if command == 'encrypt':
        generate_key()
        encryption()
    elif command == 'decrypt':
        decrypt()
    else:
        print('Wrong command name')