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#include <iostream>
#include <fstream>
#include <cmath>
#include <vector>
using namespace std;
ifstream in("cmlsc.in");
ofstream out("cmlsc.out");
int mat[1025][1025];
int n, m;
int c1[1025], c2[1025];
vector <int> afis;
void readit()
{
in>>n>>m;
for(int i=1; i<=n; i++)
in>>c1[i];
for(int i=1; i<=m; i++)
in>>c2[i];
}
int main()
{
readit();
for(int i=1; i<=n; i++)
{
for(int j=1; j<=m; j++)
{
if(c1[i]==c2[j]) mat[i][j]=mat[i-1][j-1]+1;
else mat[i][j]=max(mat[i-1][j], mat[i][j-1]);
}
}
for(int i=1; i<=m; i++)
if(mat[n][i]>mat[n][i-1]) afis.push_back(c2[i]);
out<<afis.size()<<'\n';
for(int i=0; i<afis.size(); i++) out<<afis[i]<<' ';
return 0;
}