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#include <fstream>
#include <vector>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int n,m;
int a[1055],b[1055];
int v[1055][1055];
vector<int>st;
int main()
{
f>>n>>m;
for(int i=1;i<=n;i++)
f>>a[i];
for(int i=1;i<=m;i++)
f>>b[i];
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
{
if(a[i]==b[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]<<'\n';
int i=n,j=m;
while(v[i][j])
{
if(a[i]==b[j])
{
st.push_back(a[i]);
i--;j--;
}
else
{
if(v[i-1][j]>=v[i][j-1])
i--;
else
j--;
}
}
for(int i=st.size()-1;i>=0;i--)
g<<st[i]<<" ";
return 0;
}