.data
a:	.word	1,1,1,1,1,1,1,1,1,1
str:	.asciiz "\n"



	.text
readarray:
	addi $sp,$sp,-4		# allocate space on stack
	sw $s0,0($sp)		# push $s0

	li $s0,0		# initialize counter
	
loop:	li $v0,5		# setup system call 5
	syscall			# do the system call
	beq $v0,-1,exit		# check for termination value
	sw $v0,0($a0)		# store in array
	addi $s0,$s0,4		# incr. counter
	addi $a0,$a0,4
	j loop			# repeat
exit:   move $v0,$s0
	lw $s0,0($sp)
	addi $sp,$sp,4		# pop
	jr $31			# return






main:	addi $sp,$sp,-4
	sw $31,0($sp)

	la $a0,a		# set up input arguments for readarray method
	jal readarray		# call the readarray method
	move $s0,$v0		# on return, copy num elements read into $so

	sra $s1,$s0,1
	move $s2,$s0

	addi $s2,$s2,-4
	li $s3,0

loop2:	lw $t0,a($s3)
	lw $t1,a($s2)

	sw $t0,a($s2)
	sw $t1,a($s3)

	addi $s3,$s3,4
	addi $s2,$s2,-4

	blt $s3,$s1,loop2

	li $s3,0
loop3:	li $v0,1
	lw $a0,a($s3)
	syscall


	li $v0,4
	la $a0,str
	syscall
	
	addi $s3,$s3,4
	
	blt $s3,$s0,loop3

	lw $31,0($sp)
	addi $sp,$sp,4
	jr $31