Write a function `insertDash(num)`/`InsertDash(int num)` that will insert dashes ('-') between each two odd numbers in num. For example: if num is 454793 the output should be 4547-9-3. Don't count zero as an odd number.
Note that the number will always be non-negative (>= 0).
import re
def insert_dash(num):
    return re.sub(r'[13579](?=[13579])',r'\g<0>-', str(num))
import re
def insert_dash(num):
    return re.sub(r'[13579](?=[13579])',r'\g<0>-', str(num))