;
; Ghost game
;

define HIDE ','
define SHOW '.'
define CR 13
define LF 10
define BUFFLEN (buff - mask)

org 0x100

        mov dx, title   ;
        mov ah, 0x9     ; displays welcome text
        int 0x21        ;
begin:  mov di, buff    ; destination_index = buff;
        and ax, 0x0     ; get char
        int 0x16        ;
        cmp al, 0x1B    ; if char == ESC then
        je done         ; exit
        cmp al, HIDE    ; if char == HIDE then
        je @f           ; play the game!
        mov ah, 0x2     ;
        mov dl, al      ; else display char,
        int 0x21        ;
        jmp begin       ; and try again
@@:     and ax, 0x0     ; get char
        int 0x16        ;
        cmp al, 0x1B    ; if char == ESC then
        je done         ; exit
        cmp al, SHOW    ; if char == SHOW
        je @f           ; goto last part
        stosb           ; store char to answer buff
        mov ah, 0x2     ; and show the false typed char
        mov dl, [di-BUFFLEN-1]
        int 0x21        ; from mask (di previously incremented)
        jmp @b          ; until SHOW command
@@:     and ax, 0x0     ; last part
        int 0x16        ; get char
        mov ah, 0x2     ;
        mov dl, al      ; and show
        int 0x21        ;
        cmp al, 0x1B    ; if char == ESC then
        je done         ; exit
        cmp al, CR      ; if char != CR then
        jne @b          ; get another char
        mov dl, LF      ; make next line
        int 0x21        ; and put '$' to mark the end of answer
        mov byte [di], '$'
        mov dx, buff    ;
        mov ah, 0x9     ; show the answer
        int 0x21        ;
        mov ah, 0x2     ;
        mov dl, CR      ;
        int 0x21        ;
        mov dl, LF      ; make next line
        int 0x21        ;
        jmp begin       ;
done:   mov ax, 0x4C00  ; good bye!
        int 0x21        ;

        title db 'Welcome to ghost game!', 13, 10, 'Type you question:', 13, 10, 13, 10, '$'
        mask db 'Hello weird being, could you tell me '
        buff rb BUFFLEN    

Ok. How to do it:

1- exec the binary;
2- type exactly: ,fasm.o ghost, whats the best assembler you know? [enter]
3- now you see the answer.

You got the idea?