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#include <fstream>
#include <cstring>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int n,m,a[1025],b[1025],dp[1025][1025],c[1025],k;
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])
dp[i][j]=1+dp[i-1][j-1];
else
dp[i][j]=max(dp[i-1][j],dp[i][j-1]);
}
while(n>=1 and m>=1)
{
if(a[n]==b[m])
{
c[++k]=a[n];
n--;
m--;
}
else
if(dp[n-1][m]>dp[n][m-1])
n--;
else
m--;
}
fout<<k<<"\n";
for(int i=k;i>=1;i--)
fout<<c[i]<<" ";
return 0;
}