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#include<fstream>
#include<vector>
using namespace std;
ifstream in("cmlsc.in");
ofstream out("cmlsc.out");
int main()
{
int n,m,i,j;
in>>n>>m;
vector<int> a,b,c;
vector< vector <int> > s;
s.resize(n+1);
a.resize(n);
b.resize(m);
for(i=0;i<n;i++) in>>a.at(i);
for(i=0;i<m;i++) in>>b.at(i);
s.at(0).resize(m+1);
for(i=1;i<=n;i++)
{
s.at(i).resize(m+1);
for(j=1;j<=m;j++)
s.at(i).at(j)=
(
(a.at(i-1)!=b.at(j-1)) ?
(
(s.at(i-1).at(j)>s.at(i).at(j-1)) ?
s.at(i-1).at(j)
: s.at(i).at(j-1)
)
: (s.at(i).at(j)=s.at(i-1).at(j-1)+1)
);
}
out<<s.at(n).at(m)<<'\n';
c.resize(s.at(n).at(m));
for(i=0;i<c.size();)
{
if(n>0)
{
if(s.at(n-1).at(m)+1==s.at(n).at(m))
{
n--;
c.at(i)=a.at(n);
i++;
}
else while(s.at(n-1).at(m)==s.at(n).at(m)&&n>1) n--;
}
if(m>0)
{
if(s.at(n).at(m-1)+1==s.at(n).at(m))
{
m--;
c.at(i)=b.at(m);
i++;
}
else while(s.at(n).at(m-1)==s.at(n).at(m)&&m>1) m--;
}
}
for(i=c.size()-1;i>=0;i--) out<<c.at(i)<<" ";
}