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#include <bits/stdc++.h>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int a[100001],b[100001],M[1001][1001];
stack<int> st;
int main()
{
int n,m;
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]){
M[i][j]=M[i-1][j-1]+1;
}else{
M[i][j]=max(M[i-1][j],M[i][j-1]);
}
}
}
fout<<M[n][m]<<"\n";
int i=n,j=m;
while(i>0 && j>0){
if(a[i]==b[j]){
st.push(a[i]);
i--;
j--;
}else{
if(M[i-1][j]>M[i][j-1]){
i--;
}else{
j--;
}
}
}
while(!st.empty()){
fout<<st.top()<<" ";
st.pop();
}
return 0;
}