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#include <fstream>
using namespace std;
ifstream g("cmlsc.in");
ofstream gg("cmlsc.out");
int x[1024],y[1024],c[1024],a[1024][1024],n,m,k=0;
void citire(){
g>>n>>m;
for(int i=1;i<=n;i++)
g>>x[i];
for(int i=1;i<=m;i++)
g>>y[i];
g.close();
}
int maxim(int x, int y){
if(x>y) return x;
else return y;
}
void dinamic(){
for(int i=1;i<=n;i++)
{
for(int j=1;j<=m;j++){
if(x[i]==y[j]) a[i][j]=a[i-1][j-1]+1;
else a[i][j]=maxim(a[i-1][j],a[i][j-1]);
}
}
gg<<a[n][m]<<"\n";
}
void afisaredr () {
int i,j;
k=a[n][m];
for (j=1;j<=m && k>0; j++) {
for (i=1;i<=n && k>0; i++) {
if (y[j]==x[i]){k--; gg<<y[j]<<" ";}
}
}
}
int main()
{
citire();
dinamic();
afisaredr();
return 0;
}