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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("date.in");
ofstream o("date.out");
int a[1025],b[1025],c[1025][1025],d[1025][1025],n,m;
void citire()
{
int i,j;
f>>n>>m;
for(i=1;i<=n;i++)
f>>a[i];
for(j=1;j<=m;j++)
f>>b[j];
}
void functie()
{
int i,j;
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
if(a[i]==b[j])
{
d[i][j]=14;
c[i][j]=c[i-1][j-1]+1;
}
else
if(c[i-1][j]<c[i][j-1])
{
d[i][j]=1;
c[i][j]=c[i][j-1];
}
else
{
d[i][j]=-1;
c[i][j]=c[i-1][j];
}
}
void afisare(int i, int j)
{
if(i!=0&&j!=0)
if(d[i][j]==14)
{
afisare(i-1,j-1);
cout<<a[i]<<" ";
}
else
if(d[i][j]==-1)
afisare(i-1,j);
else
afisare(i,j-1);
}
int main()
{
citire();
functie();
cout<<c[n][m]<<endl;
afisare(n,m);
return 0;
}