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#include <fstream>
#include <algorithm>
using namespace std;
ifstream cin("cmlsc.in");
ofstream cout("cmlsc.out");
const int nm=1024;
int dp[nm+5][nm+5],n,m,v1[nm+5],v2[nm+5],val;
void afisare(int r,int c)
{
if(r==0 or c==0)
return;
if(v1[r]==v2[c])
{
afisare(r-1,c-1);
cout<<v1[r]<<" ";
}
else
if(dp[r-1][c]>dp[r][c-1])
afisare(r-1,c);
else
afisare(r,c-1);
}
int main()
{
cin>>n>>m;
for(int i=1;i<=n;i++)
cin>>v1[i];
for(int i=1;i<=m;i++)
cin>>v2[i];
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
if(v1[i]==v2[j])
dp[i][j]=dp[i-1][j-1]+1;
else
dp[i][j]=max(dp[i-1][j],dp[i][j-1]);
cout<<dp[n][m]<<"\n";
afisare(n,m);
return 0;
}