Construct an input function $F(t)$ by adding$/$subtracting$,$ scaling, time$-$scaling, and$/$or multiplying one or more of the standard input functions so that the following conditions are met:

$F$ has the value $0$ for negative times.

$F$ has the value $10$ for times between $0$ s and $1$ s $.$

$F$ has the value $-10$ for times between $1$ s and $2$ s $.$

$F$ has the value $0$ for times after $2$ s $.$