Print Grandson's Name

The program must accept first and last names of three persons who are in a family tree and print the grandson’s name.

Input Format:
The first line contains the first and last name of person 1 separated by a space.
The second line contains the first and last name of person 2 separated by a space.
The third line contains the first and last name of person 3 separated by a space.

Output Format:
The first line contains the first and last name of the grandson separated by a space.

Boundary Conditions:
Length of first and last names are from 3 to 100

Note: The last name of a person is nothing but the father’s first name.

Example Input/Output 1:
Input:
Arun Kumar
Swamy Nathan
Kumar Swamy

Output:
Arun Kumar

l=[];l1=[];l2=[]
for i in range(3):
    s=input().strip().split()
    l.append(s)
    l1.append(s[0])
    l2.append(s[1])
for i in l1:
    if i not in l2:
        d=l1.index(i)
print(*l[d])