There is an error on line 68, how to fix it?

Question

assembler

IDEAL
MODEL small
STACK 100h
DATASEG
MSG1 DB 'ENTER FIVE CHARACTER : $'
MSG2 DB 10,13,'RESULT : $'
ARR1 DB 5 DUP (00)
ARR2 DB 5 DUP (00),'$'
CODESEG
start:

MACRO La
CMP AL,'z'
JA exit
CMP AL,'A'
JB exit
CMP AL,'Z'
JE decrease
CMP AL,'z'
JE decrease
CMP AL,'Y'
JE decrease
CMP AL,'y'
JE decrease
CMP AL, 'X'
JE decrease
CMP AL,'x'
JE decrease

add al,3
JMP exit
;-----------------------
decrease:
SUB AL,23
JMP exit
;-----------------------
exit:
endm
;-------------- ------------------------------

MOV AX,@DATA
MOV DS,AX

LEA SI,[ARR1 ]
LEA DI,[ARR2]

;PRINT MSG1
LEA DX,[MSG1]
MOV AH,09
INT 21H

MOV CX,5 ;NUMBER OF CHARACTER IN WORD

INPUT:
MOV AH,01
INT 21H
MOV [SI],AL
INC SI
LOOP INPUT

;--------------------------------
MOV DX,0000
MOV CX,5
LEA SI, [ARR1]

OUTPUT:
MOV AL,[SI]
main AL
MOV [DI],AL
INC SI
INC DI
LOOP OUTPUT

;-------------------------------- ---------------
LEA DX,[MSG2]
MOV AH,09
INT 21H
LEA DX,[ARR2]
MOV AH,09
INT 21H
exit:
mov ax, 4c00h
int 21h
END start

Answer 1

Probably because the macro name matches the case:

MACRO AL

Well and what is it:

main AL

unclear.