give stre columntitle represent column title appear Excel sheet return correspond column numberFor examplea 1b 2C 3Z 26aa 27ab 28 Example 1input columntitle aoutput 1example 2input columntitle ABOutput 28example 3input columntitle ZYOutput 701 Constraints1 columntitlelength 7columntitle consist uppercase english letterscolumnTitle range a FXSHRXW