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#include <fstream>
#define N 1025
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int n,m,k,i,j,a[N],b[N],c[N],x[N][N];
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++)
{
x[i][j]=max(x[i-1][j],x[i][j-1]);
if(a[i]==b[j])x[i][j]=x[i-1][j-1]+1;
}
fout<<x[n][m]<<'\n';
for(i=n,j=m;x[i][j];)
{
if(a[i]==b[j])
{
c[++k]=a[i];
i--;
j--;
}
else
if(x[i][j]==x[i][j-1])
j--;
else
i--;
}
for(;k;k--)
fout<<c[k]<<' ';
return 0;
}