How do I split O$-10$ O$+5$ A$-80$ A$+90$ B$-60$ B$+70$ AB$-50$ AB$+$h$20$ to have the number and letter values seperate so that I can call on them later? THe purpose of what I$\text{'}$m writing is to take an inputted amount and type of blood and check if there's enough of that type for the request in the primary bank and backup bank and report what's left over.