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#include <iostream>
#include <fstream>
#include <vector>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
vector <int> comun;
int n,m, v[1050],a[1050],dp[1050][1050];
int main()
{
fin>>m>>n;
for(int i = 1;i<=m;i++)
{
fin>>v[i];
}
for(int i = 1;i<=n;i++)
{
fin>>a[i];
}
for(int i = 1;i<=m;i++)
{
for(int j = 1;j<=n;j++)
{
if(v[i] == a[j])
{
dp[i][j] = dp[i-1][j-1]+1;
comun.push_back(a[j]);
}
else{
dp[i][j] = max(dp[i-1][j],dp[i][j-1]);
}
}
}
fout<<dp[m][n]<<'\n';
for(int i = 0;i<comun.size();i++)
{
fout<<comun[i]<<' ';
}
}