Solve Sudoku

Sudoku is a number puzzle.
The goal is to fill a 9×9 grid with digits such that each column, each row, and each of the nine 3×3 cells that make up the grid (also called "squares") contain all the digits from 1 to 9.
At the start of the level, the grid is partially filled, which has a unique solution.
Find this solution!

At the beginning of the game, a certain number of numbers in certain cells are known on the field.
The goal of Sudoku is to fill in all empty cells with the numbers 1-9 (one number per cell) according to the following rules:
- A number can only appear once per line
- Number can appear only once in each column
- The number can appear only once in each district (district - area of \u200b\u200bcells 3 by 3