Hi, first time posting so I hope this is in the right place pertaining to coding

I need to change the format of a coordinate, by removing the suffix ("125.00S", where S is for South) and then changing positive/negative value based on said removed suffix (N would keep the value as positive, S would change the value to negative).

in short
Input cell at A1 would read: 125.00S
I want Output cell at A2 to read: -125.00

I know I can remove the S from the string by using =Left(A1,LEN(A1)-1)
but I don't know how to use that suffix to change the number to a negative or positive value. Ideally, I would like to do this in one cell without having to use other cells.

thanks in advance.