section .bss
a resb 1

section .data
nwln db 10

section .text
global _start
_start:
;; Initialise a=0
mov [a], byte 0

;; loop 20 times
mov ecx,20
L:
mov eax,20
sub eax,ecx
cmp eax, 10
jl INCREMENT
dec byte [a]
loop L

;; a+48 + echo a
ETTER:
mov al,[a]
add al,'0'
mov [a],al
mov ecx,a
mov edx,1
call echo

call exit

INCREMENT:
inc byte [a]
loop L
jmp ETTER

echo:
mov ebx,1
mov eax,4
int 0x80
mov ecx,nwln
mov edx,2
mov ebx,1
mov eax,4
int 0x80
ret

exit:
mov eax,1
int 0x80
ret