A)

for i in range(11):

   print(20-i)

B)

res = 0  

for i in range(5):

   res += (i+1)**2

print(res)

C)

def printDivisors(n) :

   i = 1

   while i <= n :

       if (n % i==0) :

           print(i)

       i = i + 1

printDivisors(int(input("num: ")))