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#include <iostream>
#include <fstream>
#include <stack>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int n,m;
int v1[1024],v2[1024];
stack<int> s;
int d[1024][1024];
int main()
{
fin>>n>>m;
for(int i=0;i<n;i++)
fin>>v1[i];
for(int i=0;i<m;i++)
fin>>v2[i];
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
d[i][j]=(v1[i-1]==v2[j-1])?d[i-1][j-1]+1:max(d[i-1][j],d[i][j-1]);
fout<<d[n][m]<<"\n";
int i=n,j=m;
while(i>0&&j>0)
{
if(v1[i-1]==v2[j-1])
{
s.push(v1[i-1]);
i--;
j--;
}
else if(d[i-1][j]>d[i][j-1]) i--;
else j--;
}
while(!s.empty())
{
fout<<s.top()<<" ";
s.pop();
}
}