# Problem 7. ( **points** )

A number written on the board is allowed to be multiplied by 8, have 14 added to it, or have 14 subtracted from it. In each case, the old number is erased and the new number is written in its place. Initially, a single digit was written on the board. After several operations, the number 777772 appeared on the board. What digit was initially written on the board? If there are multiple answers, list all possible answers separated by commas or semicolons.
# Problem 7. (3 points)

A number written on the board can be multiplied by 8, 14 can be added to it, or 14 can be subtracted from it. In each case, the old number is erased and the new number is written in its place. Initially, a single digit was written on the board. After several operations, the number 777772 appeared on the board. What digit was initially written on the board? If there are multiple answers, list all possible answers separated by commas or semicolons.

Answer: $2 ; 9$