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#include <bits/stdc++.h>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int dp[1026][1026];
vector <int> sol;
int main()
{
int n,m;
int a[1026],b[1026];
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]);
}
}
int i=n,j=m;
while(i>=1 && j>=1)
{
if(dp[i-1][j]==dp[i][j-1] && dp[i-1][j]!=dp[i][j]){
sol.push_back(a[i]);
i--,j--;
}
else
{
if(dp[i-1][j]>dp[i][j-1])
i--;
else
j--;
}
}
fout<<dp[n][m]<<"\n";
reverse(sol.begin(),sol.end());
for(int i=0;i<sol.size();i++)
fout<<sol[i]<<" ";
return 0;
}