10809: ABC148 - A - Round One
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Description
Takahashi is solving quizzes. He has easily solved all but the last one.
The last quiz has three choices: $1$, $2$, and $3$.
With his supernatural power, Takahashi has found out that the choices $A$ and $B$ are both wrong.
Print the correct choice for this problem.
The last quiz has three choices: $1$, $2$, and $3$.
With his supernatural power, Takahashi has found out that the choices $A$ and $B$ are both wrong.
Print the correct choice for this problem.
Input
Input is given from Standard Input in the following format:
```
$A$
$B$
```
```
$A$
$B$
```
Output
Print the correct choice.
Constraints
- Each of the numbers $A$ and $B$ is $1$, $2$, or $3$.
- $A$ and $B$ are different.
- $A$ and $B$ are different.
Sample 1 Input
3
1
Sample 1 Output
2
When we know $3$ and $1$ are both wrong, the correct choice is $2$.
Sample 2 Input
1
2
Sample 2 Output
3