Help with ARM project in Keil

   I am tasked for with checking for valid UPC codes for a school assignment using ARM. I have no prior experience with assembly. After I am able to load the registers with the UPC code I am having trouble figuring out how I am to skip over the required digits and add them. The hint given to me tells me to use LSL and to keep shifting the string of characters. Not sure where to go from the code I have written.

Note: I am using the keil micro vision simulator (version 4) on windows 10.

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