This problem doesn't contain real-world specifications about domains, just use the problem statement as a formal document to solve the problem. The given string s is a domain name if it contains the characters " a "-" z ", " 0 "-" 9 " and dots. No two dots shoud follow one after another (consecutive). The dots split the given string s into the parts, the last (most right) part should have the length 2 or 3. Domain can't start or end with a dot. You are given the string s , check if it is domain name. The only line of the input contains given string s . The string may contain any characters with ASCII codes from 33 to 127, inclusive. The string length is between 1 and 100, inclusive. Print " YES " if the given string s is a domain name, or print " NO " if it is not.