3-9. Write an Assembly Language program that will sum three ASCII characters. Prompt and input three characters from the user into three labels. Add the integer ASCII values of those three characters and store the result. Output the integer sum in decimal with a label telling what you are printing. Include a blank line between input and output. Assemble the program, then run in the simulator without the debugger using input of A, P, and Z. Copy and paste the output into a blank text file. Attach the .mas file and the .txt file and submit it.