This is a tool for helping with codewords. Codewords are puzzles where a
crossword-like grid has numbers in each cell where a number represents a
particular character. The idea is to work out which number maps to which
letter of the alphabet.
Enter a string of characters with numbers in parenthesis representing
unknown characters.
For example, '(1)(2)w(2)' to search for a four-letter word where the
third letter is w, the first character is different to the other letters and
the same letter is repeated in the 2nd and 4th character positions.