Main:

# Type your code here.

j End

# Procedure Sum $($Do not modify$)$

Sum:

add $v$0,$ $a$0,$ $a$1$

jr $ra

# Procedure Dif $($Do not modify$)$

Dif:

sub $v$0,$ $a$0,$ $a$1$

jr $ra

End:

x is stored in $s$0,$ y is stored in $s$1,$ w $($sum$)$ is stored in $s$2,$ and z is stored in $s$3$