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Score : $100$ points

### Problem Statement

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.

### Constraints

• $-100 \leq A,B,C \leq 100$
• $A$, $B$ and $C$ are integers.
• The input satisfies the condition in the statement.

### Input

Input is given from Standard Input in the following format:

$A$ $B$ $C$


### Output

Among $A$, $B$ and $C$, print the integer that is different from the rest.

### Sample Input 1

5 7 5


### Sample Output 1

7


This is the same case as the one in the statement.

### Sample Input 2

1 1 7


### Sample Output 2

7


In this case, $C$ is the one we seek.

### Sample Input 3

-100 100 100


### Sample Output 3

-100