assembly - Saving integers as Strings in MIPS

Question

I was just wondering, is there any way in MIPS to store a summation of numbers as a string and later read them byte by byte, for example:

the sum 657 -> sw into a .ascii directive -> later lb on the first index to get 6 (in ascii code) same with 5 and so on. Is this possible?

Answer 1

I believe there is a flaw in ShinTakezou's answer. The line neg $a0, $a0 will convert the positive number to negative, which results in a weird output for the code. If we remove this line. The codes work fine for positive integer