Find the column number in Excel

Columns in an excel sheet are named A, B, C, D.....AA, AB etc. Given a column name as string, return the corresponding column number.

For e.g. A -> 1, B -> 2, Z -> 26, AB -> 28

Note : Column names are given in all uppercases
Input format :
String containing excel column name
Output format :
Corresponding column number
Sample Input
Sample Output

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