Save images from adresses with an ID and a random string part using iMacro

I want to save some images from a website, with addresses like this

http://ift.tt/1JRqoAP

{{ID}} varies from 01 to 99. The {{rand}} part is a string of 8 random uppercase characters for each ID. For example:

http://ift.tt/1YZaY9S

Is it possible to check all cases for the string part? if yes, could you please tell me how?