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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int n,m;
int a[1025],b[1025];
int dp[1025][1025];
int rez[1025];
int main()
{
int cont=1;
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]=dp[i-1][j-1]+1;
}
else dp[i][j]=max(dp[i-1][j],dp[i][j-1]);
}
}
fout << dp[n][m] << '\n';
int i=n,j=m;
while(i*j!=1)
{
if(dp[i-1][j]==dp[i][j]) i--;
else if(dp[i][j-1]==dp[i][j]) j--;
else
{
rez[cont++]=a[i];
i--;
j--;
}
}
for(int i=1;i<cont;i++) fout << rez[i] << ' ';
}