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#include <fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int v[1030][1030],x[1030],y[1030];
void af(int i,int j)
{
if(v[i][j]!=0)
{
if(x[i]==y[j])
{
af(i-1,j-1);
g<<x[i]<<" ";
}
else
{
if(v[i-1][j]>v[i][j-1])
af(i-1,j);
else
af(i,j-1);
}
}
}
int main()
{
int n,m,i,j;
f>>n>>m;
for(i=1;i<=n;i++)
f>>x[i];
for(i=1;i<=m;i++)
f>>y[i];
for(i=1;i<=n;i++)
{
for(j=1;j<=m;j++)
{
if(x[i]==y[j])
{
v[i][j]=v[i-1][j-1]+1;
}
else
{
v[i][j]=max(v[i-1][j],v[i][j-1]);
}
}
}
g<<v[n][m]<<endl;
af(n,m);
return 0;
}