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#include <bits/stdc++.h>
#define MAX 1030
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int n,m,A[MAX],B[MAX];
int Dp[MAX][MAX],lgmax;
void read();
void solve();
void ans();
int main(){
read();
solve();
ans();
return 0;
}
void ans(){
int i,j,dr=m;
stack <int> Ans;
fout<<lgmax<<'\n';
for(i=n;i>=1;--i)
for(j=dr;j>=1;--j){
if(lgmax==Dp[i][j]&&A[i]==B[j]){
dr=j-1;
Ans.push(A[i]);
--i;
--lgmax;
}
}
while(!Ans.empty()){
fout<<Ans.top()<<' ';
Ans.pop();
}
}
void solve(){
int i,j;
for(i=1;i<=n;++i)
for(j=1;j<=m;++j)
if(A[i]==B[j]){
Dp[i][j]=Dp[i-1][j-1]+1;
lgmax=max(lgmax,Dp[i][j]);
}else
Dp[i][j]=max(Dp[i-1][j],Dp[i][j-1]);
}
void read(){
int i;
fin>>n>>m;
for(i=1;i<=n;++i)
fin>>A[i];
for(i=1;i<=m;++i)
fin>>B[i];
}