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#include <iostream>
#include <fstream>
using namespace std;
unsigned v[1028][1028];
int main()
{
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
unsigned n,m,s=0;
f>>m>>n;
for(int i=1;i<=m;++i)
{
f>>v[0][i+1];
}
for(int i=1;i<=n;++i)
{
f>>v[i+1][0];
}
for(int i=1;i<=m;++i)
{
for(int j=1;j<=n;++j)
{
if(v[0][i+1]==v[j+1][0]) {v[i][j]=1; s++;}
}
}
g<<s<<"\n";
for(int i=1;i<=m;++i)
{
for(int j=1;j<=n;++j)
{
if(v[i][j]==1) g<<v[0][i+1]<<" ";
}
}
return 0;
}