Write a code/program for Twitter (to automatically Retweet and Favourite certain phrases)

Hi. I need a simple program for Twitter. It will be a software that continually searches every minute to retweet/favourite/follow automatically when a certain phrase is entered, or some keywords are matched. It should only retweet/follow the original post and not other retweets of the message. This needs to run on our account which we own currently. Please contact me if you have experience of this and can do this job well and make it easy for us to use.