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