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


int main() {
	int n,a[20],p;
	cin>>n;
	int i;
	for(i = 0; i < n; i++) {
		cin>>a[i];
	}
	for(i = 3;i < n;i++){
		if(a[i] != a[i-1]+a[i-2]){
			p = i+1;
			break;
		}
	}
	
	for(i = p-1;i<n;i++){
		a[i]=a[i-1]+a[i-2];
	}
	
	cout<<p<<endl;
	for(i = 0; i < n; i++) {
		cout<<a[i]<<" ";
	}
}

/**************************************************************
	Problem: 1816
	User: admin
	Language: C++
	Result: Accepted
	Time:15 ms
	Memory:2072 kb
****************************************************************/