1.  .MODEL SMALL
2.  .STACK 100H

3.  .DATA
4.  PROMPT_1   DB  'Enter the first letter : $'
5.  PROMPT_2   DB  'Enter the second letter : $'
6.  PROMPT_3   DB  'Output is : $'
7.  NEXT_LINE  DB  0DH,0AH,"$"

8.  .CODE
9.  MAIN PROC
10. MOV AX, @DATA
11. MOV DS, AX

12. MOV AH, 2
13. MOV DL, "?"
14. INT 21H

15. MOV AH, 9

16. LEA DX, NEXT_LINE
17. INT 21H

18. LEA DX, PROMPT_1
19. INT 21H

20. MOV AH, 1
21. INT 21H
22. MOV BL, AL
23. MOV AH, 9

24. LEA DX, NEXT_LINE
25. INT 21H

26. LEA DX, PROMPT_2
27. INT 21H

28. MOV AH, 1
29. INT 21H
30. MOV BH, AL
31. MOV AH, 9

32. LEA DX, NEXT_LINE
33. INT 21H

34. LEA DX, PROMPT_3
35. INT 21H

36. MOV AH, 2

37. CMP BL, BH

38. JAE @GREATER
a.  MOV DL, BL
b.  INT 21H

c.  MOV DL, BH
d.  INT 21H

e.  JMP @END

39. @GREATER:
a.  MOV DL, BH
b.  INT 21H

c.  MOV DL, BL
d.  INT 21H
40. @END:

41. MOV AH, 4CH
42. INT 21H
43. MAIN ENDP
44. END MAIN