Generally, what is the first digit of a negative whole number? In case of $-10$, it can not be $-1$, because a digit is defined to be from $0$ to $9$. Is it $1$? Or does it not have the first digit at all and it is just the first $number$ $-1$?
2026-03-25 11:02:24.1774436544
What is the first digit of $-10$?
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As per the comments, the first digit of $-10$ is $1$.