I recently have had the idea to make a game that allows the player to save the game via a save code, and hit a roadblock in the development of it when it came to the reading of the codes. before learning about MIT app inventor, I primarily used scratch to code. in scratch, there was a block that allowed the user to select a specific letter in a variable by using a number. for example, you could code it to use the logic of [if <letter (7) of (variable)> = A then:
you might want to use the segment block
http://ai2.appinventor.mit.edu/reference/blocks/text.html#segment
start in your case is 7
length in your case is 1
Taifun
Trying to push the limits! Snippets, Tutorials and Extensions from Pura Vida Apps by 
Taifun.
the global variable is not necessary. the textbox.text can be used as global variable.
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Did Scratch have lists? Those are more powerful.