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#include <iostream>
#include <fstream>
#include <algorithm>
#include <vector>
using namespace std;
int n,m,c[1025],v[1025],z[1025][1025],k=0,st[1025];
ifstream in("cmlsc.in");
ofstream out("cmlsc.out");
int main()
{
in>>n>>m;
for(int i=1;i<=n;i++)
in>>v[i];
for(int i=1;i<=m;i++)
in>>c[i];
for(int i=1;i<=n;i++)
{
for(int j=1;j<=m;j++)
if(v[i]==c[j])
z[i][j]=z[i-1][j-1]+1;
else
z[i][j]=max(z[i-1][j],z[i][j-1]);
}
out<<z[n][m]<<'\n';
int i=n,j=m;
while(i!=0 and j!=0)
{
if(v[i]==c[j])
{
k++;
st[k]=v[i],i--,j--;
}
else
if(z[i-1][j]<z[i][j-1])
j--;
else
i--;
}
for(int i=k;i>=1;i--)
out<<st[i]<<" ";
}