Быки, коровы и слова

Game for the guards and other people with a rich vocabulary.
Puzzle game on the classic rules of the bulls with the cows, but there is one caveat - the letters instead of numbers. You need to guess the word and for each answer you will receive information about how many letters in your word, coinciding with the hidden letters. Bull - some of the letters of your words there is in the word it is put forth, and the order also. Cow - some of your letter of the word is in the hidden word but in what position - is unknown.
One letter can only be one Bull or cow, the Bulls have priority over the Cows: if any letter in your word stands in the right place, but in the hidden word there is the same - the tooltip will only Bull.
The easiest way to deal with an example:
Hidden word: MILK
Run 1: DOG: 2 Bull 0 Cows (About ** K *)
Run 2: STRAW 3 Ox 1 Cow (OLT * and M **)
Attempting 3: COW 2 Ox 1 Cow (O * O * and K **)
Trying to 4: CHISEL 4 Bull, Cow 0 (* * About OLO)
Attempting to 5: TANDEM: 0 Bykov, 1 Cow (M)
Trying to 6: DEBATE: 0 Bulls 0 Cows
At this point it becomes clear that the word bull in 4 CHISEL is * * About the OLT, on a technical matter