For the next step you should write the instructions that will repeatedly read an input until a negative number is read. To do this, there are several details to address:

Question

Pick a name for a memory location where the data will be read.
Which instruction is used to read an input card into memory?
How will you get the number you just read into the accumulator to test it?
What action will you take if the number is positive and what action if it's negative?
The first step is to answer these questions in english. Explain the process of what's happening in english words.