#include <bits/stdc++.h>
#define vs vector<string>
#define vpii vector<pair<int,int> >
#define vi vector<int>
#define vvi vector<vi >
#define pb push_back

using namespace std;

void myfunc(vs& vst, vpii& vtp1, vpii& vtp2, double* ans);
pair<int,int> getinitial(vs& vst);


int main() {
    int n,m,k;
    vs vst;
    cin >> n >> m >> k;
    for(int a0 = 0; a0 < n; a0++){
        string row;
        cin >> row;
        vst.pb(row);
        // Write Your Code Here
    }
    vpii vtp1,vtp2;
    for(int a0 = 0; a0 < k; a0++){
        int i1,j1,i2,j2;
        cin >> i1 >> j1 >> i2 >> j2;
        vtp1.pb(make_pair(i1-1,j1-1));
        vtp2.pb(make_pair(i2-1,j2-1));
        // Write Your Code Here
    }
    // Write Your Code Here
    double ans = 0;
    myfunc(vst,vtp1,vtp2,&ans);
    cout << ans << endl;
    return 0;
}
pair<int,int> getinitial(vs& vst)
{
    for(int i=0;i<vst.size();i++)
    {
        for(int j=0;j<vst[0].length();j++)
        {
            if(vst[i][j]=='A')
                return make_pair(i,j);
        }
    }
    return make_pair(-1,-1);
}
void myfunc(vs& vst, vpii& vtp1, vpii& vtp2, double* ans)
{
    int n = vst.size();
    int m = vst[0].length();
    vvi visited(n,vi(m,0));
    pair<int,int> init_pos = getinitial(vst);
    list<pair<int,int> > lt;
    lt.pb(init_pos);
    
    lt.pb(make_pair(-1,-1));
    int level = 1;
    while(!lt.empty())
    {
        pair<int,int> x = lt.front();
        lt.pop_front();
        int xth = x.first;
        int yth = x.second;
        
        if(xth==-1 && yth==-1)
        {
            level++;
            if(!lt.empty())
                lt.pb(make_pair(-1,-1));       
        }
        else
        {
            visited[xth][yth] = 1;
            
            if(vst[xth][yth]=='%')
            {
                *ans = *ans + pow(0.25,level);
            }
            else
            {
                if(xth-1>=0 && (vst[xth-1][yth]=='0'|| vst[xth-1][yth]=='%') && visited[xth-1][yth]==0)
                    lt.pb(make_pair(xth-1,yth));
                if(xth+1<n && (vst[xth-1][yth]=='0'|| vst[xth-1][yth]=='%') && visited[xth+1][yth]==0)
                    lt.pb(make_pair(xth+1,yth));
                if(yth-1>=0 && (vst[xth-1][yth]=='0'|| vst[xth-1][yth]=='%') && visited[xth][yth-1]==0)
                    lt.pb(make_pair(xth,yth-1));
                if(yth+1<m && (vst[xth-1][yth]=='0'|| vst[xth-1][yth]=='%') && visited[xth][yth+1]==0)
                    lt.pb(make_pair(xth,yth+1));
            }
        }
    }
}