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#include<fstream>
using namespace std;
int x[1100][1100];
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int main()
{int a[1100],b[1100],n,m,c[1100],pas=1,i,j;
fin>>n;
fin>>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;
c[pas]=a[i];
pas++;
}
else
if(x[i][j-1]>x[i-1][j])
x[i][j]=x[i][j-1];
else
x[i][j]=x[i-1][j];
fout<<x[n][m]<<endl;
for(i=1;i<pas;i++)
fout<<c[i]<<' ';
fin.close();
fout.close();
return 0;
}