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#include <iostream>
#include <fstream>
using namespace std;
ifstream in("cmlsc.in");
ofstream out("cmlsc.out");
int mat[1025][1025],n,m,a[1025],b[1025],t[1025],c;
void citire()
{
in>>n;
in>>m;
for(int i=1;i<=n;i++)
in>>a[i];
for(int j=1;j<=m;j++)
in>>b[j];
}
void sol()
{
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
if(a[i]==b[j])
mat[i][j]=1+mat[i-1][j-1];
else
mat[i][j]=max(mat[i-1][j],mat[i][j-1]);
}
void afisare()
{
for(int i=1;i<=n;i++)
{
for(int j=1;j<=m;j++)
cout<<mat[i][j]<<" ";
cout<<endl;
}
}
void traseu(int i,int j)
{
while(mat[i][j])
{
if(a[i]==b[j])
{
t[c++]=a[i];
i--; j--;
}
else
if(mat[i][j-1]==mat[i][j])
j--;
else
i--;
}
}
int main()
{
citire();
sol();
out<<mat[n][m]<<"\n";
traseu(n,m);
for(int i=c-1;i>=0;i--)
out<<t[i]<<" ";
return 0;
}