Russian to Polish transcription python script

convertToPolish.py

#!/bin/python3
import os

russianToPolishMap = {
    "а": "a",
    "б": "b",
    "в": "w",
    "г": "g",
    "д": "d",
    "е": "ie",
    "ё": "io",
    "ж": "ż",
    "з": "z",
    "и": "i",
    "й": "j",
    "к": "k",
    "л": "l",
    "м": "m",
    "н": "n",
    "о": "o",
    "п": "p",
    "р": "r",
    "с": "s",
    "т": "t",
    "у": "u",
    "ф": "f",
    "х": "ch",
    "ц": "c",
    "ч": "cz",
    "ш": "sz",
    "щ": "szcz",
    "ъ": "\"",
    "ы": "y",
    "ь": "'",
    "э": "e",
    "ю": "iu",
    "я": "ia",
    "«": "\"",
    "»": "\""
}

for entry in os.listdir():
    if os.path.isdir(entry):
        inputText = open(os.path.join(entry, "input.txt"), "r").read().lower()
        outputText = []
        for letter in inputText:
            try:
                outputText.append(russianToPolishMap[letter])
            except KeyError:
                outputText.append(letter)
        open(os.path.join(entry, "output.txt"), "w").write("".join(outputText).replace(" czto ", " szto "))