import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;
public class recruit2021_1 {
    static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    static StringTokenizer st;
    public static void main(String[] args) throws IOException {
        String line = br.readLine();
        Solution sol = new Solution();
        System.out.println(sol.solution(line));
    }
}
class Solution {
    public String solution(String new_id) {
        StringBuilder sb = new StringBuilder(new_id);
        /* First */
        for (int i = 0; i < sb.length(); i++) {
            char temp = sb.charAt(i);
            if (temp >= 'A' && temp <= 'Z') {
                sb.setCharAt(i, (char) ('a' + (temp - 'A')));
            }
        }
        /* Second */
        for (int i = 0; i < sb.length(); i++) {
            char temp = sb.charAt(i);
            if (!((temp >= 'a' && temp <= 'z') || (temp >= '0' && temp <= '9') ||
                temp == '-' || temp == '_' || temp == '.')) {
                sb.deleteCharAt(i);
                i -= 1;
            }
        }
        /* Third */
        for (int i = 0; i < sb.length(); i++) {
            if (sb.charAt(i) == '.') {
                if (i + 1 < sb.length() && sb.charAt(i + 1) == '.') {
                    sb.deleteCharAt(i + 1);
                    i -= 1;
                }
            }
        }
        /* Fourth */
        while (sb.length() > 0 && (sb.charAt(0) == '.' || sb.charAt(sb.length() - 1) == '.')) {
            if (sb.charAt(0) == '.') {
                sb.deleteCharAt(0);
            }
            if (sb.length() > 0 && sb.charAt(sb.length() - 1) == '.') {
                sb.deleteCharAt(sb.length() - 1);
            }
        }
        /* Fifth */
        if (sb.length() == 0) {
            sb = new StringBuilder("a");
        }
        new_id = sb.toString();
        /* Sixth */
        if (new_id.length() >= 16) {
            new_id = new_id.substring(0, 15);
        }
        sb = new StringBuilder(new_id);
        while (sb.charAt(sb.length() - 1) == '.') {
            sb.deleteCharAt(sb.length() - 1);
        }
        /* Seventh */
        char last = sb.charAt(sb.length() - 1);
        while (sb.length() <= 2) {
            sb.append(last);
        }
        return sb.toString();
    }
}