You are given two strings startTime and endTime representing two valid timestamps on the same day in the format "HH:MM:SS".

Return the total number of elapsed seconds from startTime to endTime.

Constraints:

• startTime.length $= 8$

• endTime.length $= 8$

• startTime and endTime are valid times in the format "HH:MM:SS"

• $00 \leq ext{HH} \leq 23$

• $00 \leq ext{MM} \leq 59$

• $00 \leq ext{SS} \leq 59$

• endTime is not earlier than startTime

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