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#include<fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int a[257],n,m,b[1025],c[1025],y;
int main()
{
f>>m>>n;
for(int i=1;i<=m;++i)
{
f>>b[i];
a[b[i]]++;
}
for(int i=1;i<=n;++i)
{
f>>c[i];
a[c[i]]++;
if(a[c[i]]==2)
++y;
}
int x=256;
g<<y<<'\n';
for(int i=1;i<=x;++i)
{
if(a[i]==2)
g<<i<<' ';
}
g.close();
return 0;
}