#include<bits/stdc++.h>
using namespace std;
typedef long long int ll;
ll n,m,i,j,k,l,r,x,y,z,w,s,t,a[2200][2200];
char c;
int main()
{
    scanf("%lld %lld",&n,&m);
    for(i=0;i<=n+1;i++)
        for(j=0;j<=m+1;j++)
        a[i][j]=-1;
    for(i=1;i<=n;i++)
    {scanf("\n");
        for(j=1;j<=m;j++)
        {
            scanf("%c",&c);
            if(c=='W')
                a[i][j]=1;
            else
                a[i][j]=0;
        }
    }
    s=1;
    for(i=1;i<=n;i++)
    {
        for(j=1;j<=m;j++)
        {
            x=a[i][j]^1;
            if(x==a[i+1][j]||x==a[i][j+1]||x==a[i-1][j]||x==a[i][j-1])
                continue;
            s=s*2%1000000007;
        }
    }
    printf("%lld",s);
}