#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
template<typename T> bool chmin(T& a, T b){if(a > b){a = b; return true;} return false;}
template<typename T> bool chmax(T& a, T b){if(a < b){a = b; return true;} return false;}
const long long mod=998244353;
const long long mod2=469762049;
int main(){
    cout.tie()->sync_with_stdio(0);
    cin.tie(0);
    cout<<10<<endl;
    cout<<2<<" ";
    for(int i=1;i<10;i++){
        cout<<(1<<i);
        if(i==9) cout<<endl;
        else cout<<" ";
    }
}