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#include<fstream>
using namespace std;
ifstream f("clmsc.in");
ofstream g("clmsc.out");
int n,m,a[1025],b[1025],sol[1025][1025],v[1025],k;
void citire()
{
ifstream f("clmsc.in");
f>>n>>m;
for(int i=1;i<=n;++i)
f>>a[i];
for(int i=1;i<=m;++i)
f>>b[i];
}
void PD1()
{
for(int i=1;i<=n;++i)
for(int j=1;j<=m;++j)
if(a[i]==b[j])
sol[i][j]=1+sol[i-1][j-1];
else
sol[i][j]=max(sol[i-1][j],sol[i][j-1]);
}
void PD2()
{
g<<sol[n][m]<<'\n';
int i=n,j=m;
while(k)
{
if(a[i]==b[j])
{ v[k--]=a[i];
i--;j--;
}
else
if(sol[i][j-1]>sol[i-1][j])
j--;
else
i--;
}
for(int i=1;i<=sol[n][m];++i)
g<<v[i]<<' ';
g.close();
}
int main()
{
citire();
PD1();
PD2();
return 0;
}