Tudor is teaching Jason how to be productive!
One day, Tudor decides that Jason isn't taking his work seriously enough, and installs some software to monitor Jason's monitor. Jason is now only allowed to type strings which are in a whitelist.
Jason has already written some string and wishes to turn it into another string. In a single second, he can either insert a character, delete a character, or change some character in the string into another one. Note that, per the whitelist, Jason must only ever have strings in the whitelist on his monitor during any given second.
The input starts with a single integer , the number of words in the whitelist.
lines follow, each containing a single string of only uppercase letters. Each string has length at most 500. Each of these strings will be distinct.
After that, a line with a single integer follows.
After that, lines follow with two positive integers between and , the first one being the index of the word Jason starts out with and the second one being the index of the word Jason wants.
For each query line, output the minimum number of seconds Jason needs to convert the first word to the second
-1 if it is impossible for him to perform the conversion.
Sample Data ZIP
Click here for ZIP.
3 BIG BUG DAMAGE 2 1 2 1 3