Here is a quick reference for Excel column letter to number mapping.
| Column Letter | Column Number |
|---|---|
| A | 1 |
| B | 2 |
| C | 3 |
| D | 4 |
| E | 5 |
| F | 6 |
| G | 7 |
| H | 8 |
| I | 9 |
| J | 10 |
| K | 11 |
| L | 12 |
| M | 13 |
| N | 14 |
| O | 15 |
| P | 16 |
| Q | 17 |
| R | 18 |
| S | 19 |
| T | 20 |
| U | 21 |
| V | 22 |
| W | 23 |
| X | 24 |
| Y | 25 |
| Z | 26 |
| AA | 27 |
| AB | 28 |
| AC | 29 |
| AD | 30 |
| AE | 31 |
| AF | 32 |
| AG | 33 |
| AH | 34 |
| AI | 35 |
| AJ | 36 |
| AK | 37 |
| AL | 38 |
| AM | 39 |
| AN | 40 |
| AO | 41 |
| AP | 42 |
| AQ | 43 |
| AR | 44 |
| AS | 45 |
| AT | 46 |
| AU | 47 |
| AV | 48 |
| AW | 49 |
| AX | 50 |
| AY | 51 |
| AZ | 52 |
| BA | 53 |
| BB | 54 |
| BC | 55 |
| BD | 56 |
| BE | 57 |
| BF | 58 |
| BG | 59 |
| BH | 60 |
| BI | 61 |
| BJ | 62 |
| BK | 63 |
| BL | 64 |
| BM | 65 |
| BN | 66 |
| BO | 67 |
| BP | 68 |
| BQ | 69 |
| BR | 70 |
| BS | 71 |
| BT | 72 |
| BU | 73 |
| BV | 74 |
| BW | 75 |
| BX | 76 |
| BY | 77 |
| BZ | 78 |
| CA | 79 |
| CB | 80 |
| CC | 81 |
| CD | 82 |
| CE | 83 |
| CF | 84 |
| CG | 85 |
| CH | 86 |
| CI | 87 |
| CJ | 88 |
| CK | 89 |
| CL | 90 |
| CM | 91 |
| CN | 92 |
| CO | 93 |
| CP | 94 |
| CQ | 95 |
| CR | 96 |
| CS | 97 |
| CT | 98 |
| CU | 99 |
| CV | 100 |
| CW | 101 |
| CX | 102 |
| CY | 103 |
| CZ | 104 |
Can you also provide the Column# for column till AAA or so?