Шифрование слова переменой мест букв

s = input()
 
i = 0
j = (len(s) + 1) // 2
 
a = ''
while i < (len(s) + 1) // 2:
    a += s[i]
    if j < len(s):
        a += s[j]
    i += 1
    j += 1
print(a)

s = input()
s1 = ''
s2 = ''
if len(s) % 2 == 0:
    for i in range(len(s)):
        if i < (len(s) // 2):
            s1 += s[i]
        else:
            s2 += s[i]
    p = min(len(s1), len(s2))
    s = ''
    for i in range(p):
        s += s1[i] + s2[i]
    print(s)
else:
    for i in range(len(s)):
        if i <= (len(s) // 2):
            s1 += s[i]
        else:
            s2 += s[i]
    p = min(len(s1), len(s2))
    s = ''
    for i in range(p):
        s += s1[i] + s2[i]
    print(s + s1[len(s1) - 1])

s = input('->') + ' '
m = len(s) // 2
res = ''
for j in range(m):
    for i in range(2):
        res += s[i*m + j]
print(res.strip())

from itertools import zip_longest
s = input('->') + ' '
m = len(s) // 2
res = list(zip_longest(s[:m], s[m:], fillvalue=''))
res = ''.join(a + b for a,b in res).strip()
print(res)

s = input('->') + ' '
m = len(s) // 2
res = ''.join([s[:m][i] + s[m:][i] for i in range(m)]).strip()
print(res)