# Master Mind

Find the four-digit number designated by asterisks, given the following:

-All four digits of the unknown number are different.

-None of the digits is zero.

-Each "0" on the right of each four-digit number below indicates that the number has a matching digit in a non-matching position with the unknown number.

-Each "+" on the right of each four-digit number below indicates that the number has a matching digit in a matching position with the unknown number.

          6152    +0
4182    00
5314    00
5789     +
-------------
****

×