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