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