You should read an expression from the user as String format (AH=0AH -> INT 21H). Then you should examine the string char by char and decide whether inspected char belongs to "Uppercase" or "Lowercase" type. You should print each char type to the screen till you reach at the end of the string denoted as "$" (e.g. For string "Hello$", output should be "Uppercase, Lowercase, Lowercase, Lowercase, Lowercase").

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STACK_SEG SEGMENT STACK USE16 DB 100 DUP(?) STACK_SEG ENDS DATA_SEG SEGMENT 'DATA' USE16 MESSAGE DB 'ASSIGN1',0DH,0AH DB 'Welcome: $' OUTMSG DB 0DH,0AH,'Output: $' INCHAR DB ? INSTRING DB 80, ?, 80 DUP('$') NEWLINE DB 0DH,0AH,'$' DATA_SEG ENDS CODE_SEG SEGMENT PARA 'CODE' PUBLIC USE16 ASSUME CS:CODE_SEG, DS:DATA_SEG, SS:STACK_SEG MAIN PROC FAR PUSH DS XOR AX,AX PUSH AX MOV AX,DATA_SEG MOV DS,AX LEA DX,MESSAGE MOV AH,9 INT 21H MOV AH,1 INT 21H MOV INCHAR,AL MOV AH,0AH LEA DX,INSTRING INT 21H LEA DX,OUTMSG MOV AH,9 INT 21H MOV DL,INCHAR MOV AH,2 INT 21H LEA DX,INSTRING+2 MOV AH,9 INT 21H MOV DX,OFFSET NEWLINE MOV AH,9 INT 21H RET MAIN ENDP CODE_SEG ENDS END MAIN