var first = str.Substring(0, 1);

var last = str.Substring(str.Length - i,1); 

string left = "[";string right = "]";int IndexofLeft = stra.IndexOf(left);int IndexofRight = stra.IndexOf(right);string arr = stra.Substring(IndexofLeft + 1, IndexofRight - IndexofLeft -1);string[] Array = arr.Split(string[]{‘,‘});foreach(string a in Array){ Console.WriteLine(a);}

int qBefore = str.IndexOf("Q");var before = str.Substring(0, qBefore- 1).Trim(); 

int qAfter = str.LastIndexOf("Q"); var after= str.Substring(qAfter + 1).Trim();