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