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#include <fstream>
using namespace std;
ifstream cin("cmlsc.in");
ofstream fout("cmlsc.out");
int n,m,v[1025],w[1025],dp[1025][1025],i,j,mx,k,st[1025];
int main()
{
cin>>n>>m;
for(i=1;i<=n;i++)
cin>>v[i];
for(i=1;i<=m;i++)
cin>>w[i];
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
{
dp[i][j]=max(dp[i-1][j],dp[i][j-1]);
if(v[i]==w[j])dp[i][j]=dp[i-1][j];
}
mx=dp[n][m];
i=n;
j=m;
fout<<mx<<"\n";
while(mx)
{
if(v[i]==w[j])
{
k++;
st[k]=v[i];
mx--;
i--;
j--;
}
else if(mx==dp[i-1][j]) i--;
else j--;
}
for(i=k;i>=1;i--)
{
fout<<st[i]<<" ";
}
return 0;
}