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#include <iostream>
#include <fstream>
#include <vector>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int dp[1025][1025];
short n,m,i,j;
short a[1025],b[1025];
int p;
vector <short> v;
int main()
{
fin>>m>>n;
for(i=1;i<=m;i++)
fin>>a[i];
for(j=1;j<=n;j++)
fin>>b[j];
for(i=1;i<=m;i++){
for(j=1;j<=n;j++){
dp[i][j]=max(dp[i-1][j],max(dp[i][j-1],dp[i-1][j-1]+(a[i]==b[j])));
}
}
fout<<dp[m][n]<<'\n';
for(i=1;i<=m;i++){
for(j=1;j<=n;j++){
if(dp[i][j]>p && a[i]==b[j]){
v.push_back(a[i]);
p=dp[i][j];
}
}
}
for(auto it:v)
fout<<it<<' ';
return 0;
}