#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define vll vector<ll>
#define vvll vector<vll>
#define vpll vector<pair<ll, ll>>
#define pll pair<ll, ll>
#define rep(i, n) for(ll i = 0; i < (ll)n; i++)
#define rep1(i, n) for(ll i = 1; i <= (ll)n; i++)
#define fi first
#define se second

#define debug false

void read(vector<string>& out){
    ll N; cin >> N;
    out = vector<string>(N);
    rep(i, N){
        cin >> out[i];
    }
}

ll decode(const vector<string>& in){
    ll j = 0;
    while(in[0][j] == '.'){
        j++;
    }

    ll N = (ll)in.size();
    ll M = (ll)in[0].size();

    ll rs = 1;
    rep(i, N-1){
        if(j == M-1){
            rs = 2 * rs + 1;
            j = M - 2;
            continue;
        }

        if(j == 0){
            rs = 2 * rs;
            j = 1;
            continue;
        }

        if(in[i+1][j-1] == '#'){
            rs = 2 * rs + 1;
            j--;
            continue;
        }

        rs = 2 * rs;
        j++;
    }

    return rs;
}

void encode(vector<string>& out, const ll in){
    ll j = 0;
    ll left = 0;
    ll right = 0;
    ll steps = 0;

    ll x = in;
    while(x > 1){
        if(x % 2 == 0){
            j--;
            if(j < left) left = j;
        } else {
            j++;
            if(j > right) right = j;
        }
        x = x / 2;
        steps++;
    }

    out = vector<string>(steps+1);

    x = in;
    ll N = steps + 1;
    ll i = N - 1;
    ll M = right - left + 1;
    j = M - right - 1;

    rep(l, M){
        out[i] += '.';
    }
    out[i][j] = '#';
    i--;
    while(x > 1){
        if(x % 2 == 0){
            j--;
            if(j < left) left = j;
        } else {
            j++;
            if(j > right) right = j;
        }
        x = x / 2;
        rep(l, M){
            out[i] += '.';
        }
        out[i][j] = '#';
        i--;
    }
}

int main() {
//    freopen("./in.txt", "r", stdin);
//    freopen("./out.txt", "w", stdout);
//    cout << "COMMENT THIS OUT" << endl;
    cin.tie(nullptr);
    cout.tie(nullptr);
    ios_base::sync_with_stdio(false);

    vector<string> a, b;
    read(a);
    read(b);

    ll adec = decode(a);
    ll bdec = decode(b);

//    cout << adec << " " << bdec << endl;

    vector<string> rs;
    encode(rs, adec + bdec);

    cout << (ll)rs.size() << endl;
    rep(i, rs.size()){
        cout << rs[i] << endl;
    }

    return 0;
}