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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int main()
{
int v1[257],v3[257], v2[257],i,j,k=0,n,m,a=1;
f>>n>>m;
for(i=1;i<=n;i++)
f>>v1[i];
for(i=1;i<=m;i++)
f>>v2[i];
for(i=1;i<=n;i++)
{for(j=1;j<=m;j++)
if(v1[i]==v2[j])
{k++;v3[a]=v1[i];a++;}
}
g<<k<<'\n';
for(i=1;i<a;i++)
g<<v3[i]<<" ";
return 0;
}