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#include <iostream>
#include <fstream>
using namespace std;
ifstream in("cmlsc.in");
ofstream out("cmlsc.out");
int main()
{
int n,m;
int v1[1024],v2[1024];
in>>n>>m;
for(int i=1;i<=n;i++)
in>>v1[i];
for(int i=1;i<=m;i++)
in>>v2[i];
int v3[1024];
int l=0;
int poz=1;
for(int i=1;i<=n;i++)
{
for(int j=poz;j<=m;j++)
{
if(v1[i]==v2[j])
{
l++;
v3[l]=v2[j];
poz=j+1;
break;
}
}
}
out<<l<<"\n";
for(int i=1;i<=l;i++)
out<<v3[l]<<" ";
return 0;
}