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#include <fstream>
using namespace std;
int n,m,dp[2025][2025];
int s[2025],t[2025];
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int main(){
fin>>n>>m;
for(int i=1;i<=n;i++)
fin>>s[i];
for(int i=1;i<=m;i++)
fin>>t[i];
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
if(s[i]==t[j])
dp[i][j]=1+dp[i-1][j-1];
else{
dp[i][j]=max(dp[i-1][j],dp[i][j-1]);
}
fout<<dp[n][m]<<'\n';
int i = n,j = m;
int rez[1025],cnt = 0;
while(i!=0 ){
if(s[i]==t[j]){
rez[++cnt]=s[i];
i--,j--;
}
else{
if(dp[i-1][j]>=dp[i][j-1])
i--;
else
j--;
}
}
for(int i=cnt;i>=1;i--)
fout<<rez[i]<<" ";
return 0;
}