Please help me! How i can output character that moves around the perimeter of a rectangle (10*5 or 15*7) in console with TASM?

.MODEL small
.STACK 100h
.CODE   
start:
    mov ah,03
    int 10h      
    mov cx,10   

    A:
    push cx

    mov ah,03
    int 10h 

    mov ah,02h
    inc dl
    int 10h

    mov al,42
        int 29h 

    pop cx
    LOOP A

        mov  ah,4ch                   
        int  21h

end start

I do not know how to solve the problem...