#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;

bool cmp(pair<int,int> a, pair<int,int> b)
{
    return a.first < b.first;
}

bool cmp1(vector<int> a, vector<int> b)
{
    return a[1] < b[1];
}

int main(){
    int n,m;
    cin>>n;
    vector<pair<int,int>> v(n+1);

    string a;

    cin>>a;


    int res1=1,res2=1,pos;

    for(int i=0;i<a.size();i++)
    {
        if(a[i] == '#')
        {
            pos = i;
            break;
        }
    }

    for(int i=1;i<n;i++)
    {
        cin>>a;

        if(pos>0)
        {
            if(a[pos-1] == '#')
            {
                res1 = res1*2+1;
                pos--;
            }
        }
        
        if(pos<a.size())
        {
            if(a[pos+1] == '#')
            {
                res1 = res1*2;
                pos++;
            }
        }

    }

    cin>>m;

    cin>>a;


    for(int i=0;i<a.size();i++)
    {
        if(a[i] == '#')
        {
            pos = i;
            break;
        }
    }

    for(int i=1;i<m;i++)
    {
        cin>>a;

        if(pos>0)
        {
            if(a[pos-1] == '#')
            {
                res2 = res2*2+1;
                pos--;
            }
        }
        
        if(pos<a.size())
        {
            if(a[pos+1] == '#')
            {
                res2 = res2*2;
                pos++;
            }
        }

    }

    int res=res1+res2,tmp = res,cnt=1,odd=0,even=0;

    vector<int>steps;

   while(tmp!=1)
   {
        if(tmp%2==0)
        {
            even++;
            steps.push_back(1);
        }
        else {
            odd++;
            steps.push_back(-1);
        }

        tmp/=2;
        cnt++;
   }

    cout<<cnt<<endl;

    int width = abs(odd-even)+1; 
    
    if(steps[steps.size()-1] == 1)
    {
        pos = 0;
    }
    else pos = width-1;

    string c;

    for(int i=0;i<width;i++)
    {
        c+='.';
    }

    c[pos] = '#';

    for(int i=0;i<cnt;i++)
    {
        cout<<c<<'\n';
        c[pos] = '.';
        pos+=steps[i];
        c[pos] = '#';
    }



    return 0;
}