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