#include <iostream>
#include <vector>
#include <algorithm>
#include <string>
#include <queue>
#include <stack>
#include <cmath>
#include <iomanip>
#include <fstream>
#include <map>
#include <set>

using namespace std;
struct ver
{
	vector<int> np;
	ver() {
		np.resize(4, -1);
	}
};
bool fl = false;
vector<ver> g1, g2;
vector<pair<int, int>> go = { { -1, 0 } ,{ 0, 1 },{ 1, 0 } ,{ 0, -1 } };
vector<vector<char>> mat(100, vector <char>(100, '.'));
void dfs1(int x, int y, int v, char cv, int pr)
{
	mat[x][y] = cv;
	for (int i = 0; i != 4; i++)
	{
		if (g1[v].np[i] == -1)
		{
			continue;
		}
		pair<int, int> e = go[(i + pr) % 4];
		int xx = x + e.first;
		int yy = y + e.second;
		if (mat[xx][yy] == '.')
		{
			dfs1(xx, yy, g1[v].np[i], cv, pr);
		}
		else
		{
			if (mat[xx][yy] == '2')
			{
				fl = true;
				return;
			}
		}
	}
	return;
}
void dfs2(int x, int y, int v, char cv, int pr)
{
	mat[x][y] = cv;
	for (int i = 0; i != 4; i++)
	{
		if (g2[v].np[i] == -1)
		{
			continue;
		}
		pair<int, int> e = go[(i + pr) % 4];
		int xx = x + e.first;
		int yy = y + e.second;
		if (mat[xx][yy] == '.')
		{
			dfs2(xx, yy, g2[v].np[i], cv, pr);
		}
	}
	return;
}
int kol = 0;
bool gr = false;
vector<vector<bool>> used(100, vector<bool>(100, false));
void dfs(int x, int y)
{
	kol++;
	used[x][y] = true;
	for (int i = 0; i != 4; i++)
	{
		pair<int, int> e = go[i];
		int xx = x + e.first;
		int yy = y + e.second;
		if (xx > -1 && xx < 100 && yy > -1 && yy < 100)
		{
			if (mat[xx][yy] == '.' && used[xx][yy] == false)
			{
				dfs(xx, yy);
			}
		}
		else
		{
			gr = true;
		}
	}
}
int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	ifstream cin("input.txt");
	//ifstream cin("program.in");
	//ofstream cout("program.out");
	int cur = 0;
	int h1, h2;
	cin >> h1 >> h2;
	vector<vector<char>> col1(h1, vector<char>(h2));
	vector<vector<int>> num1(h1, vector<int>(h2, -1));
	for (int i = 0; i != h1; i++)
	{
		for (int j = 0; j != h2; j++)
		{
			cin >> col1[i][j];
			if (col1[i][j] == '*')
			{
				num1[i][j] = cur;
				cur++;
			}
		}
	}
	g1.resize(cur);
	for (int i = 0; i != h1; i++)
	{
		for (int j = 0; j != h2; j++)
		{
			if (col1[i][j] == '*')
			{
				for (int k = 0; k != 4; k++)
				{
					pair<int, int> e = go[k];
					int x = i + e.first;
					int y = j + e.second;
					if (x > -1 && x < h1 && y > -1 && y < h2)
					{
						if (col1[x][y] == '*')
						{
							g1[num1[i][j]].np[k] = num1[x][y];
						}
					}
				}
			}
		}
	}
	cur = 0;
	cin >> h1 >> h2;
	vector<vector<char>> col2(h1, vector<char>(h2));
	vector<vector<int>> num2(h1, vector<int>(h2, -1));
	for (int i = 0; i != h1; i++)
	{
		for (int j = 0; j != h2; j++)
		{
			cin >> col2[i][j];
			if (col2[i][j] == '*')
			{
				num2[i][j] = cur;
				cur++;
			}
		}
	}
	g2.resize(cur);
	for (int i = 0; i != h1; i++)
	{
		for (int j = 0; j != h2; j++)
		{
			if (col2[i][j] == '*')
			{
				for (int k = 0; k != 4; k++)
				{
					pair<int, int> e = go[k];
					int x = i + e.first;
					int y = j + e.second;
					if (x > -1 && x < h1 && y > -1 && y < h2)
					{
						if (col2[x][y] == '*')
						{
							g2[num2[i][j]].np[k] = num2[x][y];
						}
					}
				}
			}
		}
	}
	dfs2(50, 50, 0, '2', 0);
	int mx = -1;
	for (int x1 = 40; x1 != 60; x1++)
	{
		for (int y1 = 40; y1 != 60; y1++)
		{
			for (int p = 0; p != 4; p++)
			{
				fl = false;
				if (mat[x1][y1] == '.')
				{
					dfs1(x1, y1, 0, '1', p);
				}
				if (fl)
				{
					continue;
				}
				for (int i = 0; i != 100; i++)
				{
					for (int j = 0; j != 100; j++)
					{
						if (used[i][j] == false)
						{
							gr = false;
							kol = 0;
							dfs(i, j);
							if (gr)
							{
								continue;
							}
							mx = max(mx, kol);
						}
					}
				}
				used.resize(100, vector<bool>(100, false));
				mat.resize(100, vector<char>(100, '.'));
				dfs2(50, 50, 0, '2', 0);
			}
		}
	}
	cout << mx;
	return 0;
}