You need to check if a string made of '1', '2', and '/' is an 11/22 string. An 11/22 string has an odd length, starts with '1's, has a '/' in the middle, and ends with '2's. If it follows these rules, print 'Yes'; otherwise, print 'No'.
Input: '11/22'
Output: Yes
Input: '/'
Output: Yes