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#include <fstream>
#include <iostream>
using namespace std;
int main()
{
ifstream in("cmlsc.in");
ofstream out("cmlsc.out");
int n,m;
in>>n>>m;
int vn[n+1],vm[m+1],i,j,tab[n+1][m+1];
for(i=1;i<=n;i++)
{
in>>vn[i];
}
for(i=1;i<=m;i++)
{
in>>vm[i];
}
for(i=0;i<=n;i++)
{
for(j=0;j<=m;j++)
{
tab[i][j]=0;
}
}
int sir[min(n,m)],k=0;
for(i=1;i<=n;i++)
{
for(j=1;j<=m;j++)
{
if(vn[i]==vm[j])
{
tab[i][j]=1+tab[i-1][j-1];
sir[k]=vn[i];
k++;
}
else
{
if(tab[i-1][j]>tab[i][j-1])
{
tab[i][j]=tab[i-1][j];
}
else
{
tab[i][j]=tab[i][j-1];
}
}
}
}
out<<tab[n][m]<<"\n";
for(i=0;i<k;i++)
{
out<<sir[i]<<" ";
}
in.close();
out.close();
return 0;
}