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#include<fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int x[10050],y[10050],n,m,a[10050][10050];
void citire()
{
int i;
f>>n>>m;
for(i=1;i<=n;i++)
f>>x[i];
for(i=1;i<=m;i++)
f>>y[i];
}
void sub()
{
int i,j;
for(i=1;i<=n;i++)
{
for(j=1;j<=m;j++)
{
if(x[i]==y[j])
a[i][j]=a[i-1][j-1]+1;
else
{
a[i][j]=max(a[i-1][j],a[i][j-1]);
}
}
}
}
void afis()
{
int i,j,k=0,v[1050];
i=n; j=m;
g<<a[n][m]<<"\n";
while(i!=0 && j!=0)
{
if(x[i]==y[j])
{ v[++k]=x[i];
i--;
j--;
}
else
{
if(a[i][j]==a[i][j-1])
j--;
else i--;
}
}
for(i=k;i>=1;i--)
g<<v[i]<<" ";
}
int main()
{
citire();
sub();
afis();
return 0;
}