Printing output

[rounin]

First let me say, I'm very, very, (very) new at Assembly. I'm using NASM on Linux. I have an undeclared variable that I'm putting numbers I'm getting from user input.

When I try to output the numbers, I'm not getting anything. I'm not sure what I'm doing wrong. Could anyone help me with this?

I realize I still need to work on getting the input down, but for now, I'd be happy to get it to print what I want and that is primarily the values I've inputted into the variable "sum".

;=====================================================
section .data ; DECLARED VARIABLES
;=====================================================

big db "bigger than 50", 0xA
blen equ $ - big ; length of string "big"
small db "smaller than 51", 0xA
slen equ $ - small ; length of string "small"
greet db "Enter any two digit number", 0xA
glen equ $ - greet ; length of string "greet"

;=====================================================
section .bss ; UNDECLARED VARIABLES
;=====================================================

chr resw 2 ; reserve uninitialized data
sum resw 2 ; reserve for a converted number
num resw 1 ; reserve for a converted number

;=====================================================
section .text ; CODE TEXT
;=====================================================

global main

main:
mov ax, 0
mov [sum], ax

;============================
;loop begins here
;============================
intro:
mov eax, 4 ; system call number (sys_write)
mov ebx, 1 ; first argument: file handle (stdout)
mov ecx, greet ; second argument: pointer to num
mov edx, glen ; third argument: length of string
int 0x80
beg:
mov eax, 3 ; system call number (sys_read)
mov ebx, 0 ; first argument: file handle (stdin)
mov ecx, chr ; second argument: pointer to character
mov edx, 2 ; third argument: length
int 0x80 ; call kernel

cmp byte [chr], 0x30
jb e1 ; char < '0', so get out
cmp byte [chr], 0x39
ja e1 ;mov ecx, sum
;mov edx, 5 ; char > '9', so get out

mov ax, [sum]
imul ax, 10
mov bx, 0
mov bl, [chr]
sub bl, 0x30
add ax, bx
mov [sum], ax
jmp beg

e1:
cmp word [sum], 50
jb smt6 ; smaller than 6
mov ecx, big
mov edx, blen
jmp e2

smt6:
mov ecx, small
mov edx, slen

e2:
mov eax, 4 ; system call number (sys_write)
mov ebx, 1 ; first
int 0x80 ; call kernel

mov eax, 4 ; system call number (sys_write)
mov ebx, 1 ; first
mov ecx, sum
;mov edx, 1
int 0x80 ; call kernel

mov eax, 1 ; system call number (sys_exit)
mov ebx, 0 ; exit number
int 0x80 ; call kernel