Ans is wombat but I don't know the working of. for i in range(len(first),0,-1): function please explain

Question

first = "wombat"
second = " "
for i in range(len(first),0,-1):
second = first[i-1] + second
Print(second)

Answer 1

The for in loop here is like :
for i in range (len (first),0,-1):

Length of first is 6. Hence, the loop will iterate from 6 to 0. -1 is specifying that loop will go in descending order rather than ascending order. That's why it will go from 6 to 0 and not from 0 to 6. Jay Matthews has explained further part pretty well.