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#include<fstream>
#include<cstring>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int n,m,i,j,x[1110][1110],a[1110],b[1110];
void afis(int i, int j)
{
if(i>=1 && j>=1)
{
if(a[i]==b[j])
{
afis(i-1,j-1);
fout<<a[i]<<' ';
}
else
if(x[i-1][j]>x[i][j-1] && i>1)
afis(i-1,j);
else
afis(i,j-1);
}
}
int main()
{
fin>>n>>m;
for(i=1;i<=n;i++)
fin>>a[i];
for(i=1;i<=m;i++)
fin>>b[i];
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
{
if(a[i]==b[j])
x[i][j]=x[i-1][j-1]+1;
else
x[i][j]=max(x[i-1][j],x[i][j-1]);
}
fout<<x[n][m]<<'\n';
afis(n,m);
return 0;
}