I try to make a time converter using mips on qtspim, can someone tell me whats wrong with my code?the problems may be on operations and storing answer

Question

main: li $t1,1 li $t2,2 li $t3,3 li $t4,4 li $t5,5 li $t6,6

la $a0,msg
li $v0,4
syscall

la $a0,msg2
li $v0,4
syscall

menu: la $a0,msg3 li $v