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#include <fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int i,j,n,k,m,a[1025],b[1025],v[1025][1025],tata[1025][1025],nr,sol[1025];
void recursiv(int i, int j){
if(tata[i][j]!=0){
if(tata[i][j]==1)
recursiv(i-1,j);
else if(tata[i][j]==2){
sol[k]=a[i];
k--;
recursiv(i-1,j-1);
}
else
recursiv(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]){
v[i][j]=v[i-1][j-1]+1;
tata[i][j]=2;
}
else{
if(v[i-1][j]>v[i][j-1]){
v[i][j]=v[i-1][j];
tata[i][j]=1;
}
else{
v[i][j]=v[i][j-1];
tata[i][j]=3;
}
}
}
nr=v[n][m];
fout<<nr<<'\n';
i=n;
j=m; k=nr;
recursiv(n,m);
for(i=1;i<=nr;i++)
fout<<sol[i]<<' ';
return 0;
}