PROGRAMMING:Use the balance to find the ball
The three balls a, B and C have the same size and shape, and one of them has a different weight from the other balls. Ask to find this different ball.
###Input format:
Input three positive integers in one line, corresponding to the weight of balls a, B and C in order.
###Output format:
Output the only different ball in a row.
###Input example:
```in
1 1 2
```
###Output example:
```out
C
```
answer：If there is no answer, please comment
###Input format:
Input three positive integers in one line, corresponding to the weight of balls a, B and C in order.
###Output format:
Output the only different ball in a row.
###Input example:
```in
1 1 2
```
###Output example:
```out
C
```
answer：If there is no answer, please comment