Bulls & Cows

You will have to guess a four letter word..To make it easy all the letters will be unique..After entering the word you will be given a hint in the form of a 'Bull' and a 'Cow'.For example.. If the word that you have to guess is 'Four'And you entered a word 'Fern'You will be given a hint '1bull and 1cow'Since the letter 'F' is in the same location its conveyed as 1 bullAnd though the letter 'R' is present in the word guessed, and since it is in a wrong place... You get '1 cow'Similarly if you have guessed a word which has 2 letters in the right place and 2 letters in the wrong place.. You will be given '2 Bulls 2 cows'Needless to say, the person who gets 4 bulls I.e. who guessed the right word wins :-)