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#include <fstream>
using namespace std;
ifstream f ("cmlsc.in");
ofstream g ("cmlsc.out");
int n,m,i,a[1030],b[1030],mat[1030][1030],j,fin[1030],nr;
int main()
{
f>>m>>n;
for(i=1; i<=m; ++i)
f>>a[i];
for(i=1; i<=n; ++i)
f>>b[i];
for(i=1;i<=m;++i)
{
for(j=1; j<=n; ++j)
{
if(a[i]==b[j])
{
mat[i][j]=mat[i-1][j-1]+1;
}
else
{
if(mat[i][j-1]>mat[i-1][j])
mat[i][j]=mat[i][j-1];
else
mat[i][j]=mat[i-1][j];
}
}
}
g<<mat[m][n]<<"\n";
for(i=n, j=m; i>0 && j>0;)
{
if (a[i]==b[j])
{
fin[++nr]=a[i];
j--;
i--;
}
else
if (mat[i-1][j]> mat[i][j-1])
i--;
else
j--;
}
for(i=nr; i>=1; --i)
g<<fin[i]<<" ";
return 0;
}