C++

Number of solutions: 1 Solution 1: @bbbbbbbbcc@cc abbddb@b@ccccc @aa@dbbbbdeecc aaddddd@ddgec@ aaa@fdddddg@cc ahhff@f@gggeee i@hhhfjjj@geee ihhi@fkjjeeee@ i@iihkkjjj@len iiiiikkj@jll@n mm@mm@kkkjllnn mmmmmkkkjj@j@n mm@mmm@kknjjnn mmmm@mmkk@nnnn