Why isn't this printing

[Seijuro]

Basically this program takes two numbers and adds them together, but I can't get it to print the sum. Any help would be appreciated!!

section .data

	big db "Too Big", 0xA
	blen equ $ - big




section .bss

	chr resb 2
	sum resw 1
	num resw 1

section .text
	
	global main

main:

	mov ax, 0
	mov [sum], ax

begin:
	
	mov eax, 3
	mov ebx, 0
	mov ecx, chr
	mov edx, 2
	int 0x80

	cmp byte [chr], 0x30
	jb  e1
	cmp byte [chr], 0x39
	ja e1

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

e1:
	cmp word [sum], 10
	jb e3
	mov ecx, big
	mov edx, len
	jmp e2

e3:
	mov ecx, sum 
	mov edx, 2

e2:
	mov eax, 4
	mov ebx, 1
	int 0x80

	mov eax, 1
	mov ebx, 0
	int 0x80