AtCoder currently holds four series of regular contests: `ABC`, `ARC`, `AGC`, and `AHC`.

What is the series of regular contests currently held by AtCoder in addition to $S_1$, $S_2$, and $S_3$?

Input is given from Standard Input in the following format:

```
$S_1$
$S_2$
$S_3$
```

Print the answer.

-   Each of $S_1$, $S_2$, and $S_3$ is `ABC`, `ARC`, `AGC`, or `AHC`.
-   $S_1$, $S_2$, and $S_3$ are pairwise different.

ABC

Given in input are ARC, AGC, and AHC. The rest is ABC.