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#include <iostream>
#include <fstream>
#define MAX 1026
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int n,m,k,a[MAX],b[MAX],dp[MAX][MAX],sol[MAX];
int main()
{
fin>>n>>m;
int i,j;
for(i=1;i<=n;i++)fin>>a[i];
for(i=1;i<=m;i++)fin>>b[i];
for(i=1;i<=n;i++)
for(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]);
}
for(i=n,j=m;i;)
{
if(a[i]==b[j])
{
sol[++k]=a[i];
i--;j--;
}
else if(dp[i-1][j]<dp[i][j-1])
j--;
else
i--;
}
fout<<dp[n][m]<<'\n';
for(i=k;i>=1;i--)fout<<sol[i]<<" ";
return 0;
}