P10481 Sudoku

Sudoku is a very simple task. A square table with 9 rows and 9 columns is divided to 9 smaller squares 3x3 as shown on the Figure. in some of the cells arewriten decimal digits ftom 1 to 9. The other cels are empty. The goal is to fill the empty cels with decimal digis from 1 to 9, one digit per cell, in such waythat in each rowy, in each column and in each marked 3x3 subsquare, allthe digits from 1 to 9 to appear. Write a program to solve a given Sudoku-task. 

The input data will start with the number ofthe test cases. For each test case,9 lines follow, corresponding to the rows ofthe table. On each line a string ofexactly 9 decimal digits is given, corresponding to the cells in this line. If a cell is empty it is represented by 0.

For each test case your program should print the solution in the same format as the input data. The empty cells have to be filled according to the rules. lf solutions is not unique, then the program may print any one of them.