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#include <fstream>
#include <algorithm>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmslc.out");
int mat[1026][1026],v[1026],x[1026],i,n,j,m,rec[1026],cont=0;
int main()
{
f>>m>>n;
for (i=1; i<=m; i++) f>>v[i];
for (i=1; i<=n; i++) f>>x[i];
for (i=1; i<=m; i++)
for (j=1; j<=n; j++)
if (v[i]==x[j])
mat[i][j]=mat[i-1][j-1]+1;
else
mat[i][j]=max(mat[i-1][j],mat[i][j-1]);
i=m; j=n;
while (i && j)
if (v[i]==x[j])
{
rec[++cont]=v[i];
i--;
j--;
}
else
if (mat[i-1][j]>mat[i][j-1])
i--;
else
j--;
g<<cont<<'\n';
for (i=cont; i>=1; i--) g<<rec[i]<<" ";
return 0;
}