import java.io.*;
import java.util.*;
import java.util.regex.Pattern ;
import java.util.regex.Matcher ;
public class Solution {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in) ;
        String s = in.nextLine() ;
        String pattern = "^[0-9]{2}(-|:|---|\\.){1}[0-9]{2}\\1[0-9]{2}\\1[0-9]{2}$"  ;
        Pattern pat  = Pattern.compile(pattern) ;
        Matcher matcher = pat.matcher(s) ;
        boolean match = matcher.find() ;
        if(match)
        {
            System.out.println("true") ;
        }
        else
        {
            System.out.println("false") ;
        }  
    }
}