class Solution {
    public static void main(String[] args) {
        String s = "00-44  48 5555 8361";
        System.out.println(solution(s));
        String s2 = "00-44  48 5555 8361 xxx 1";
        System.out.println(solution(s2));
        String s3 = "12345";
        System.out.println(solution(s3));
    }
 
    public static String solution(String s) {
        return s.replaceAll("[^\\d]", "").replaceAll("...", "$0-").replaceAll("-$", "");
    }
}

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