Ответ:

На питоне

4.

def F(n):

 r = 0

 while n != 0:

   f = n % 10

   r = r * 10 + f

   n //= 10

 return r

n = int(input())

print(F(n))

5.

a = [int(i) for i in input().split()]

print(sum(a))

6.

t = input()

kg = input()

g = input()

t = int(t[6::])

kg = int(kg[3::])

g = int(g[2::])

print(t * 1000000 + kg * 1000 + g, 'г')