Write a program in MIPS assembly language to compute the average of an ASCII

odd number string containing only integer decimal string. You can use pseudo

instructions. Your program should expect register $a$0$ to hold the address of a

null$-$terminated string containing some combination of the digits $0$ through $9.$ Your

program should compute the sum of the even integer value equivalent to each digit

in the string, then place this number in register $v$0.$ If a non$-$digit character

appears anywhere in the string, your program should stop with the value $-1$ in

register $v$0.$ For example, if register $a$0$ points to a sequence of three bytes $50$ten,

$53$ten, $52$ten, $52$ten $($the null terminated string $255),$ then when the program stops,

register $v$0$ should contain the value of $5,$ which is computed as $(5+5)/2.$