.model small
.stack 100h
.data
prompt db 'type a line of text',0dh,0ah,'$'

cap_msg db       0dh,0ah,'first capital ='
first db        '['
      db        ' last capital= '
last  db        '@ $'


.code
main proc
  mov ax,@data
  mov ds.ax
  ;2014200000007 MD.Sumon Sardar
  mov ah,9
  lea dx,prompt
  int 21h
  mov ah,1
  int 21h

while_:
 cmp al,0dh
 je end_while
 cmp al,'a'
 jnge end_if
 cmp al 'z'
 jnle end_if

 cmp al,first
 jnl checl_last
 mov first,al

check_last:
 cmp al,last
 jng end_if
 mov last,al

end_if:
 int 21h
 jmp while_

end_while:
 mov ah,9
 cmp first,'['
 jne caps
 lea dx,nocap_msg
 jmp display

caps:
 lea dx, cap_msg

display:
 int 21h
 mov ah,4ch
 int 21h
main endp
 end main