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#include<fstream>
#define nmax 500010
using namespace std;
ifstream f("reguli.in");
ofstream g("reguli.out");
long n,i,nr,x;
long long v[nmax],s;
void citire()
{
f>>n;
for(i=1;i<=n;i++)
f>>v[i];
}
void rezolva()
{
nr=1;
for(i=2;i<n;i++)
{
s=v[i+1]-v[i];
x=i%nr;
if(x==0)
x=nr;
if(s!=v[x+1]-v[x])
nr=i;
}
}
void scrie()
{
g<<nr<<"\n";
for(i=1;i<=nr;i++)
g<<v[i+1]-v[i]<<"\n";
}
int main()
{
citire();
rezolva();
scrie();
return 0;
}