#include<bits/stdc++.h>
using namespace std;

#define rep(i,n) for(ll i=0;i<(n);++i)
#define reps(i,n) for(ll i=1;i<=(n);++i)
using ll = long long;
using str = vector<char>;
constexpr long long INF = (1LL<<60);
constexpr long long MOD = (1e9+7);
template<class T>inline T gcd(T a,T b){if(b==0)return a; return(gcd(b,a%b));}
template<class T>inline T lcm(T a,T b){return a/gcd(a,b)*b;}
template<class T>inline bool chmax(T &a,const T &b){if(a<b){a=b;return true;}return false;}
template<class T>inline bool chmin(T &a,const T &b){if(a>b){a=b;return true;}return false;}
inline void dump(){cout<<endl;}
template<class Head,class... Tail>inline void dump(Head&& head, Tail&&... tail){cout<<head<<", ";dump(forward<Tail>(tail)...);}
template<typename T>inline istream &operator>>(istream&input,vector<T>&v){for(auto &elemnt:v)input>>elemnt;return input;}

main(){
  cin.tie(0);
  ios::sync_with_stdio(0);
  cout<<fixed<<setprecision(10);
  
  ll n,k;
  cin>>n>>k;
  ll m=(n-1)/k+1;
  m=max(m,k);
  cout<<m<<endl;
  ll a=n,num=0;
  rep(i,m){
    ll x,y,z;
    x=k*(num/k);
    y=(a-k>=0?k:a);
    z=m-x-y;
    a-=k;
    a=max(a,0ll);
    num++;
    rep(i,x)cout<<".";
    rep(i,y)cout<<"#";
    rep(i,z)cout<<".";
    cout<<endl;
  }
  


}