2020 vs 2018 - المسألة

#3762. 2020 vs 2018

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The 2020 Hunan Collegiate Programming Contest

This problem is prepared by ftiasch .

题外话：你还记得 2018 年让你输出 2018 字符画的湖南省赛吗？

Bobo 有一副 $n$ 行 $m$ 列，只包含 . 和 o 两种字符的字符画。其中 . 是背景，o 画出了 2018 或者 2020。请识别给出的字符画是 2018 还是 2020 的。

Input

输入文件包含多组数据，请处理到文件结束。

每组数据的第一行包含两个整数 $n$ 和 $m$，接下来的 $n$ 行每行包含 $m$ 个字符表示字符画。

$1 \leq n, m \leq 50$
数据组数不超过 $100$.
字符画
- 只包含 . 和 o 两种字符；
- 只会是 2018 或者 2020 的字符画；
- 不同数字的字符 o 不会（在 $8$ 个方向上）相邻；
- 笔画都是水平或者竖直的，但是大小和位置都可能任意出现。

Output

对于每组数据，如果给出的字符画是 2020，输出 2020，否则输出 2018.

样例输入

6 14
..............
.oo.ooo.oo.ooo
..o.o.o..o.o.o
.oo.o.o.oo.o.o
.o..o.o.o..o.o
.oo.ooo.oo.ooo
6 14
....ooo....ooo
.oo.o.o..o.o.o
..o.o.o..o.ooo
.oo.o.o..o.o.o
.o..ooo..o.o.o
.oo......o.ooo
11 12
ooo...ooo...
o.o.....o...
ooo...ooo...
......o.....
ooooo.o.ooo.
o...o.o...o.
o...o.ooo.o.
o...o.....o.
o...o...ooo.
o...o...o...
ooooo...ooo.

样例输出

2020
2018
2020

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