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#include <fstream>
using namespace std;
ifstream in("cmlsc.in");
ofstream out("cmlsc.out");
int mat[1100][1100];
int a[1100], b[1100];
int vec[1100];
int main()
{
int n, m, k=0;
in>>n>>m;
for(int i=1; i<=n; i++)
in>>a[i];
for(int j=1; j<=m; j++)
in>>b[j];
for(int i=1; i<=n; i++)
for(int j=1; j<=m; j++)
{
if(a[i]==b[j])
mat[i][j]=mat[i-1][j-1]+1;
else
mat[i][j]=max(mat[i][j-1], mat[i-1][j]);
}
int i=n, j=m;
while(i>0 && j>0)
{
if(a[i]==b[j])
{
vec[++k]=a[i];
i--;
j--;
}
else if(mat[i-1][j]>mat[i][j-1])i--;
else j--;
}
out<<k<<'\n';
for(i=k; i>=1; i--)
out<<vec[i]<<" ";
in.close();
out.close();
return 0;
}