entrada([ [-,4,-,  -,-,-,  -,1,-],      %   Solution shown      6 4 3  9 7 5  2 1 8       
          [-,-,8,  -,3,-,  9,-,-],      %      for this         2 7 8  4 3 1  9 5 6       
          [-,-,-,  6,8,2,  -,-,-],      %   input example:      5 1 9  6 8 2  3 4 7       
                                        %                 
          [3,2,-,  -,6,-,  -,7,9],      %                       3 2 5  8 6 4  1 7 9       
          [-,-,7,  -,-,-,  4,-,-],      %                       1 8 7  3 5 9  4 6 2       
          [9,6,-,  -,1,-,  -,8,3],      %                       9 6 4  2 1 7  5 8 3       
                                        %                                      
          [-,-,-,  7,9,8,  -,-,-],      %                       4 5 2  7 9 8  6 3 1       
          [-,-,1,  -,2,-,  7,-,-],      %                       8 3 1  5 2 6  7 9 4       
          [-,9,-,  -,-,-,  -,2,-] ]).   %                       7 9 6  1 4 3  8 2 5