<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _cmp_bystrlen_reverse(a, b):
 """A private "cmp" function to be used by the "sort" function of a list when ordering the titles found in a knowledge base by string- length - LONGEST -> SHORTEST. @param a: (string) @param b: (string) @return: (integer) - 0 if len(a) == len(b); 1 if len(a) < len(b); -1 if len(a) > len(b); """

    if len(a) > len(b):
        return -1
    elif len(a) < len(b):
        return 1
    else:
        return 0