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#include <fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int a[1<<10],b[1<<10],mat[1<<10][1<<10],m,n;
void re(int i,int j)
{if(mat[i][j]==0)
return;
if(a[i]==b[j])
{
re(i-1,j-1);
fout<<a[i]<<' ';
}
else
{
if(mat[i-1][j]==mat[i][j])
{
re(i-1,j);
}
else
re(i,j-1);
}
}
int main()
{
fin>>m>>n;
int i,j;
for(i=1; i<=m; i++)
fin>>a[i];
for(j=1; j<=n; j++)
fin>>b[j];
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
mat[i][j]=max(mat[i-1][j],mat[i][j-1]);
fout<<mat[m][n]<<'\n';
re(m,n);
return 0;
}