String Alternate pattern

The program must accept a string S as the input. The program must print the desired pattern as shown in the Example Input/Output section.

Boundary Condition(s):
1 <= Length of S <= 100

Input Format:
The first line contains S.

Output Format:
The lines containing the desired pattern as shown in the Example Input/Output section.

Example Input/Output 1:
Input:
abcdefghijklmno
Output
a
no
bcd
jklm
efghi

Example Input/Output 2:
Input:
skillrack
Output:
S
ck
kil
Ira

Example Input/Output 3:
Input
junk
Output
j
nk
u

n=input().strip()
ct=1
while n:
if ct&1:
print(n[:ct])
n=n[ct:]
else:
print(n[-ct:])
n=n[:-ct]
ct+=1