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