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#include <fstream>
#include <vector>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int n,m;
vector<short> a(1025),b(1025),v;
vector<vector<int>> dp(1025,vector<int>(1025));
void reconstrunct(int i,int j) {
if(i==0 || j==0)
return;
if(a[i]==b[j]) {
v.push_back(a[i]);
reconstrunct(i-1,j-1);
} else if (dp[i-1][j] < dp[i][j-1])
reconstrunct(i,j-1);
else
reconstrunct(i-1,j);
}
int main() {
fin>>n>>m;
for(int i=1; i<=n; i++)
fin>>a[i];
for(int i=1; i<=m; i++)
fin>>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]);
reconstrunct(n,m);
fout<<dp[n][m]<<'\n';
for (auto it=rbegin(v); it!=rend(v); it++)
fout<<*it<<' ';
return 0;
}