start
program:  4718 
scalars:  5401 
arrays :  5441 
end arr:  5441 
after MID$(A$, 1, 1)
program:  4718 
scalars:  5401 
arrays :  5448 
end arr:  5448 
after MID$(B$(1), 1, 1)
program:  4718 
scalars:  5401 
arrays :  5448 
end arr:  5490 
