1718.py

# 암호
import sys

num_to_alp = {
    1: "a",
    2: "b",
    3: "c",
    4: "d",
    5: "e",
    6: "f",
    7: "g",
    8: "h",
    9: "i",
    10: "j",
    11: "k",
    12: "l",
    13: "m",
    14: "n",
    15: "o",
    16: "p",
    17: "q",
    18: "r",
    19: "s",
    20: "t",
    21: "u",
    22: "v",
    23: "w",
    24: "x",
    25: "y",
    26: "z",
}
alp_to_num = {
    "a": 1,
    "b": 2,
    "c": 3,
    "d": 4,
    "e": 5,
    "f": 6,
    "g": 7,
    "h": 8,
    "i": 9,
    "j": 10,
    "k": 11,
    "l": 12,
    "m": 13,
    "n": 14,
    "o": 15,
    "p": 16,
    "q": 17,
    "r": 18,
    "s": 19,
    "t": 20,
    "u": 21,
    "v": 22,
    "w": 23,
    "x": 24,
    "y": 25,
    "z": 26,
}


original = sys.stdin.readline().rstrip()
hash = sys.stdin.readline().rstrip()

hash_num = 0
for i in original:
    if hash_num == len(hash):
        hash_num = 0

    if i == " ":
        print(" ", end="")
        hash_num += 1
        continue
    password_num = alp_to_num[i] - alp_to_num[hash[hash_num]]

    if password_num <= 0:
        password_num += 26
    print(f"{num_to_alp[password_num]}", end="")

    hash_num += 1