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#include <fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int n,m,i,j;
int lungime;
int a[1030];
int b[1030];
int r[1030];
int d[1030][1030];
int main()
{
fin>>n>>m;
for(i=1; i<=n; i++)
fin>>a[i];
for(j=1; j<=m; j++)
fin>>b[j];
d[0][0]=d[0][1]=d[1][0]=0;
for(i=1; i<=n; i++)
for(j=1; j<=m; j++)
{
d[i][j]=max(d[i-1][j],d[i][j-1]);
if(a[i]==b[j] && d[i-1][j-1]+1>=d[i][j])
d[i][j]=d[i-1][j-1]+1, r[d[i][j]]=a[i];
}
fout<<d[n][m]<<'\n';
for (i=n,j=m;i&&j;){
if (a[i]==b[j]){
r[++r[0]]=a[i],i--,j--;
}
else if (d[i-1][j]>d[i][j-1]) i--;
else j--;
}
for (i=r[0];i>0;i--){
fout<<r[i] << ' ';
}
fout<<'\n';
return 0;
}