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#include <fstream>
#define DIM 1034
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int n,m;
int a[DIM],b[DIM],D[DIM][DIM];
void afisare(int i,int j){
if(i==0 || j==0) return;
if(a[i]==b[j]){
afisare(i-1,j-1);
g<<a[i]<<" ";
}
else{
if(D[i-1][j]>D[i][j-1]) afisare(i-1,j);
else afisare(i,j-1);
}
}
int main(void){
register int i,j;
f>>n>>m;
for(i=1;i<=n;i++) f>>a[i];
for(j=1;j<=m;j++) f>>b[j];
for(i=1;i<=n;i++){
for(j=1;j<=m;j++){
if(a[i]==b[j])
D[i][j]=1+D[i-1][j-1];
else
D[i][j]=max(D[i-1][j],D[i][j-1]);
}
}
g<<D[n][m]<<"\n";
afisare(n,m);
f.close();
g.close();
return 0;
}