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