public static String decode(String encoded) {
        StringBuilder sb = new StringBuilder(encoded);
        String str = sb.reverse().toString();
        StringBuilder ans = new StringBuilder();
        int i = 0;
        int num = 0;
        while (i < str.length()) {
            num = num * 10 + Integer.parseInt(str.charAt(i++) + "");
            if (isInRange(num)) {
                char ch = (char) (num);
                ans.append(ch);
                num = 0;
            }

        }
        return ans.toString();
    }

    private static boolean isInRange(int num) {
        return (num >= 65 && num <= 90) || (num >= 97 && num <= 122) || (num == 32);
    }