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#include <fstream>
#include <queue>
using namespace std;
ifstream cin("cmlsc.in");
ofstream cout("cmlsc.out");
int dp[1025][1025],n,m,a[1025],b[1025],lmax=0;
queue <int>s;
void read()
{
cin>>n>>m;
for(int i=0;i<n;i++)
cin>>a[i];
for(int i=0;i<m;i++)
cin>>b[i];
}
void cmlsc()
{
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
{
if(a[i-1]==b[j-1])
dp[i][j]=dp[i-1][j-1]+1;
else
dp[i][j]=max(dp[i-1][j],dp[i][j-1]);
if(dp[i][j]>lmax)
{
lmax=dp[i][j];
s.push(a[i-1]);
}
}
}
void afisare()
{
cout<<lmax<<'\n';
while(!s.empty())
{
cout<<s.front()<<' ';
s.pop();
}
}
int main()
{
read();
cmlsc();
afisare();
return 0;
}