Score : 100 points
You are given three integers, A, B and C.
Among them, two are the same, but the remaining one is different from the rest.
For example, when A=5,B=7,C=5, A and C are the same, but B is different.
Find the one that is different from the rest among the given three integers.
Input is given from Standard Input in the following format:
A B C
Among A, B and C, print the integer that is different from the rest.
5 7 5
7
This is the same case as the one in the statement.
1 1 7
7
In this case, C is the one we seek.
-100 100 100
-100