#include <bits/stdc++.h>
using namespace std;
int main(void){
    int h,w;
    cin>>h>>w;
    vector<string> s(h);
    for(int i=0;i<h;i++){
        cin>>s[i];
    }
    vector<array<int,2>>ans;
    for(int i=0;i<h;i++){
        for(int j=0;j<w;j++){
            if(s[i][j]=='.'){
                if((i==0||s[i-1][j]=='#')&&(i!=h-1&&s[i+1][j]=='.')){
                    ans.push_back({i,j});
                }else if((j==0||s[i][j-1]=='#')&&(j!=w-1&&s[i][j+1]=='.')){
                    ans.push_back({i,j});
                }
            }
        }
    }
    cout<<ans.size()<<endl;
    for(auto x:ans){
        string r,c;
        cin>>r>>c;
        if((x[1]==0||s[x[0]][x[1]-1]=='#')&&(x[1]!=w-1&&s[x[0]][x[1]+1]=='.')){
            int t=x[1];
            for(int i=0;;i++){
                if(i+t<w&&s[x[0]][i+t]=='.'){
                    cout<<"a";
                }else{
                    break;
                }
            }
        }else{
            cout<<'-';
        }
        cout<<" ";
        if((x[0]==0||s[x[0]-1][x[1]]=='#')&&(x[0]!=h-1&&s[x[0]+1][x[1]]=='.')){
            int t=x[0];
            for(int i=0;;i++){
                if(i+t<h&&s[i+t][x[1]]=='.'){
                    cout<<"a";
                }else{
                    break;
                }
            }
        }else{
            cout<<'-';
        }
        cout<<endl;
    }
    return 0;
}