Given a string columnTitle representing an Excel sheet column label, return the corresponding column number.

Excel column labels use a base $26$ system with uppercase letters, where "A" maps to $1$, "B" maps to $2$, …, and "Z" maps to $26$. After "Z", the labels continue as "AA", "AB", and so on.

Constraints:

• $1 \leq$ columnTitle.length $\leq 7$

• columnTitle consists only of uppercase English letters.

• columnTitle is in the range ["A", "FXSHRXW"].

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