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#include <fstream>
#include <vector>
using namespace std;
ifstream cin("cmlsc.in");
ofstream cout("cmlsc.out");
#define NMAX 1024
int a[NMAX][NMAX];
int x[NMAX];
int y[NMAX];
int n,m;
int main()
{
cin >> n >> m;
for(int i=0;i<n;i++)
cin >> x[i];
for(int j=0;j<m;j++)
cin >> y[j];
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
if(x[i-1]==y[j-1])
a[i][j]=1+a[i-1][j-1];
else
a[i][j]=max(a[i-1][j],a[i][j-1]);
cout << a[n][m] << '\n';
int i=n;
int j=m;
vector<int> sol;
while(a[i][j])
{
if(x[i-1]==y[j-1])
{
sol.push_back(x[i-1]);
i--;
j--;
}
else
{
if(a[i-1][j]<a[i][j-1])
j--;
else
i--;
}
}
for(int i=sol.size()-1;i>=0;i--)
cout << sol[i] << ' ';
return 0;
}