n = [3, 4, 5, 6, 7, 8, 9]
def modify(ilist):
for i in reversed(range(len(ilist))):
if ilist[i] % 2:
del ilist[i]
else:
ilist[i] //= 2
modify(n)
print(n)
biA9IFszLCA0LCA1LCA2LCA3LCA4LCA5XQoKZGVmIG1vZGlmeShpbGlzdCk6CiAgICBmb3IgaSBpbiByZXZlcnNlZChyYW5nZShsZW4oaWxpc3QpKSk6CiAgICAgICAgaWYgaWxpc3RbaV0gJSAyOgogICAgICAgICAgICBkZWwgaWxpc3RbaV0KICAgICAgICBlbHNlOgogICAgICAgICAgICBpbGlzdFtpXSAvLz0gMgoKbW9kaWZ5KG4pCnByaW50KG4p