[Haskell-cafe] How to deal with a translator???

Hello all, Now I am trying on a simple translator module. This module needs to translate an input string( this string represent a formula) as follows: (x^2 - 5x + 4=0) /\ (x^3 - 5>0) -> x>3 And I want the output string represent a formula like: (x^2 - 5x + 4=0) /\ (x^3 - 5>0) IMPLIES x>3, i.e, the translator attempt to translate (->) into IMPLIES. If you have ay suggesstions for that kind of problems, please share with me. I appreciate for that. Thanks all for your time. Nguyen,