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#include <fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
const int N_MAX=1025;
int vn[N_MAX],vm[N_MAX],dp[256][256];
int main()
{
int n,m;
fin>>n>>m;
for(int i=1;i<=n;i++)
fin>>vn[i];
for(int i=1;i<=m;i++)
fin>>vm[i];
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
{
if(vn[i]==vm[j])
dp[i][j]=1+dp[i-1][j-1];
else
dp[i][j]=max(dp[i][j-1],dp[i-1][j]);
}
int rasp[N_MAX],ri=dp[n][m],i=n,j=m;
int cri=ri;
while(i>0&&j>0)
{
if(vn[i]==vm[j])
{
rasp[cri]=vn[i];
cri--;
i--;
j--;
}
else if(dp[i-1][j]>dp[i][j-1])
i--;
else j--;
}
fout<<ri<<endl;
for(int i=1;i<=ri;i++)
fout<<rasp[i]<<" ";
return 0;
}