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#include <fstream>
using namespace std;
ifstream in("cmlsc.in");
ofstream out("cmlsc.out");
const int N=1025;
int n,m, a[N], b[N], d[N][N];
void afisare(int l, int co){
if(l!=0 && co!=0){
if(a[l]==b[co]){
afisare(l-1,co-1);
out<<a[l]<<" ";
}
else
if(d[l-1][co]>d[l][co-1])
afisare(l-1,co);
else
afisare(l,co-1);
}
}
int main()
{
int i,j;
in>>n>>m;
for(i=1;i<=n;i++)
in>>a[i];
for(i=1;i<=m;i++)
in>>b[i];
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{
if(d[i-1][j]>d[i][j-1])
d[i][j]=d[i-1][j];
else
d[i][j]=d[i][j-1];
}
out<<d[n][m]<<"\n";
afisare(n,m);
return 0;
}