4:

with open('Input.txt') as file:

   n = file.readline().strip()

with open('Output.txt', 'w') as file:

   if n == n[::-1]:

       file.write('1')

   else:

       file.write('0')

5:

k = input('k = ')

if k.count(k[0]) == 2 or k.count(k[1]) == 2:

   print(1)

else:

   print(0)