#include<bits/stdc++.h>
using namespace std;
const int MOD=1e9+7;
int main()
{
	ios_base::sync_with_stdio(false);
	int n,m;
	cin>>n>>m;
	vector<string> s(n+5);
	s[0]=string(m+5,' ');
	s[n+1]=string(m+5,' ');
	for(int i=1;i<=n;i++)
	{
		string t;
		cin>>t;
		s[i]=' '+t+' ';
	}
	auto check=[&](int x,int y,char ch)
	{
		if(1<=x and x<=n and 1<=y and y<=m and s[x][y]!=ch)return true;
		return false;
	};
	long long ans=1;
	for(int i=1;i<=n;i++)
		for(int j=1;j<=m;j++)
		{
			int bad=0;
			if(check(i,j-1,s[i][j]))bad=1;
			if(check(i,j+1,s[i][j]))bad=1;
			if(check(i-1,j,s[i][j]))bad=1;
			if(check(i+1,j,s[i][j]))bad=1;
			if(not bad)ans=(ans*2)%MOD;
		}
	cout<<ans<<endl;
	return 0;
}