Update app.py

app.py

@@ -11,7 +11,7 @@ def build(size=5):
     print(box)
     box_cent=math.ceil(len(box)/2)
     print(box_cent)
-    cent=int(box_cent/2)
+    cent=math.ceil(box_cent/2)
     print(cent)
     print(box_cent[cent])
     num_h,num_v=0,0