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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin ("cmslc.in");
ofstream fout("cmslc.in");
int ma[1030][1030], v[1025], v2[1025], gasit[1025];
int main()
{
int n, m, z = 0;
fin >> n >> m;
for(int i = 1; i<=n; i++)
{
fin >> v[i];
}
for(int j = 1; j<=m; j++)
{
fin >> v2[j];
}
for(int i = 1; i <= n; i++)
for(int j = 1; j<=m; j++)
{
if(v2[j] == v[i])
{
gasit[++z] = v2[j];
ma[i][j] = ma[i-1][j-1] + 1;
}
else
{
ma[i][j] = max(ma[i-1][j], ma[i][j-1]);
}
}
fout << ma[n][m] << '\n';
for(int i = 1; i<=z; i++) fout << gasit[i] << ' ';
return 0;
}