public static string gridChallenge(List<string> grid)
    {
        const string YES = "YES";
        const string NO = "NO";
        var rowSize = grid.Count - 1;
        var columnSize = grid.First().Length;
        var horizontallyOrderedNumericRows = grid.Select(st => st.Select(ch => (int)ch).Order().ToArray()).ToArray();
        
        for (int i = 0; i < columnSize; i++)
        {
           for (int j = 0; j < rowSize; j++)
           {
                if (horizontallyOrderedNumericRows[j][i] > horizontallyOrderedNumericRows[j + 1][i])
                {
                    return NO;
                }
           } 
        }
        
        return YES;
    }