assembly language

what does this program do? don't show the output, explain what the program is about

.data

limit: .word 50

space: .asciiz " "

newline: .asciiz " "

tab_space: .asciiz "\t"

msg_01: .asciiz "A Sample MIPS code "

msg_02: .asciiz "The program ... "

msg_03: .asciiz " End of program ! "

.text

.globl main

main: la $a0, msg_01

li $v0, 4

syscall

la $a0, msg_02

li $v0, 4

syscall

lw $a0, limit

la $a1, space

loop: beq $0, $a0, exit

addi $a0, $a0, -1

li $v0, 1

syscall

move $t0, $a0

move $a0, $a1

li $v0, 4

syscall

move $a0, $t0

j loop

exit: la $a0, msg_03

li $v0, 4

syscall

li $v0, 10

syscall