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#include <fstream>
#include <vector>
#include <algorithm>
using namespace std;
ifstream in("cmlsc.in");
ofstream out("cmlsc.out");
int m,n;
int a[1030],b[1030];
int dp[1030][1030];
vector<int> ans;
int main()
{
in>>n>>m;
for(int i=1; i<=n; i++) in>>a[i];
for(int i=1; i<=m; i++) in>>b[i];
for(int i=1; i<=n; i++)
for(int j=1; j<=m; j++)
{
if(a[i]==b[j]) dp[i][j]=dp[i-1][j-1]+1;
else dp[i][j]=max(dp[i-1][j],dp[i][j-1]);
}
int i,j;
for(i=n,j=m; i && j;)
{
if(a[i]==b[j])
{
ans.push_back(a[i]);
i--; j--;
}
else if(dp[i-1][j]>dp[i][j-1]) i--;
else j--;
}
out<<ans.size()<<'\n';
for(int i=ans.size()-1; i>=0; i--)
out<<ans[i]<<" ";
return 0;
}