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#include <fstream>
using namespace std;
ifstream f("reguli.in");
ofstream g("reguli.out");
int i,n,urm[500005],a[500005],x,y,k,nr;
int main()
{
f>>n>>x;
for(i=1;i<n;i++)
{
f>>y;
a[i]=y-x;
x=y;
}
urm[1]=0;
k=0;
for(i=2;i<n;i++)
{
while(k>0 && a[k+1]!=a[i]) k=urm[k];
if(a[k+1]==a[i]) k++;
urm[i]=k;
}
nr=n-urm[n-1]-1;
g<<nr<<'\n';
for(i=1;i<=nr;i++)
g<<a[i]<<'\n';
}