section .bss
answer  resb    1

section .text
global _start

_start:
        ; read one byte of data from stdin
        mov     eax, 0x03       ; sys_read
        mov     ebx, 0x00       ; stdin
        mov     ecx, answer
        mov     edx, 0x01
        int     0x80

        ; counter
        mov     cx, [answer]
        sub     cx, 0x30        ; get non-ascii value

        loop_start:
                add     cx, 0x30
                push    cx       ; push ascii value

                ; write the current counter value
                mov     eax, 0x04
                mov     ebx, 0x01
                mov     ecx, esp
                mov     edx, 0x01
                int     0x80

                ; check if the loop is done
                pop     cx
                sub     cx, 0x30
                dec     cx
                cmp     cx, 0x00
                jge     loop_start

        ; write newline
        push    0x0a
        mov     eax, 0x04
        mov     ebx, 0x01
        mov     ecx, esp
        mov     edx, 0x01
        int     0x80

        ; exit program
        mov     eax, 0x01       ; sys_exit
        mov     ebx, 0x00       ; no file descriptor
        int     0x80