Где ошибка ?

public class Solution {
    public static Map<Integer, String> map = new HashMap<Integer, String>();

    static {
        map.put(0, "ноль");
        map.put(1, "один");
        map.put(2, "два");
        map.put(3, "три");
        map.put(4, "четыре");
        map.put(5, "пять");
        map.put(6, "шесть");
        map.put(7, "семь");
        map.put(8, "восемь");
        map.put(9, "девять");
        map.put(10, "десять");
        map.put(11, "одиннадцать");
        map.put(12, "двенадцать");
    }

    public static void main(String[] args) throws IOException {
        String str;
        String[] str1;
        BufferedReader bufferedReader1 = new BufferedReader(new InputStreamReader(System.in));
        String nameFile = bufferedReader1.readLine();
        bufferedReader1.close();
        try (BufferedReader bufferedReader = new BufferedReader(new FileReader(nameFile))) {
            while ((str = bufferedReader.readLine()) != null) {
                str1 = str.split(" ");
                for (int i = 0; i < str1.length; i++) {
                    try {
                        int key = Integer.parseInt(str1[i]);
                        if (map.containsKey(key)) {
                            str = str.replace(String.valueOf(key), map.get(key));
                        }
                    } catch ( NumberFormatException e ) {
                    }
                }
                System.out.println(str);
            }
        }
    }
}