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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin ("cmlsc.in");
ofstream fout ("cmlsc.out");
int n,m,a[1030],b[1030],ma[1030][1030];
void afis(int i,int j)
{
if(ma[i][j]>0)
{
while(ma[i-1][j]==ma[i][j])
i--;
while(ma[i][j-1]==ma[i][j])
j--;
afis(i-1,j-1);
fout<<a[i]<<" ";
}
}
int main()
{
fin>>n>>m;
for(int i=1;i<=n;i++)
fin>>a[i];
for(int j=1;j<=m;j++)
fin>>b[j];
for(int i=1;i<=n;i++)
{
for(int j=1;j<=m;j++)
{
if(a[i]==b[j])
ma[i][j]=max(ma[i-1][j],max(ma[i][j-1],ma[i-1][j-1]+1));
else
ma[i][j]=max(ma[i-1][j],ma[i][j-1]);
}
}
fout<<ma[n][m]<<'\n';
afis(n,m);
return 0;
}