A rope is cut into two pieces. The ratio of the length of the longer piece to the length of the shorter piece is 7: 5. <br> The length of the shorter piece is $$\frac{A}{B}$$ <hr>A: <input min="0" type="number" class="lineinput" placeholder="?" /> B:<input min="0" type="number" class="lineinput" placeholder="?" />