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#include <bits/stdc++.h>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
const int NMAX = 1050;
int dp[NMAX][NMAX];
int n,m,a[NMAX],b[NMAX];
pair <int,int> prev[NMAX][NMAX];
int main()
{
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;
prev[i][j]=make_pair(i-1,j-1);
}
else{
dp[i][j]=max(dp[i-1][j],dp[i][j-1]);
if(dp[i-1][j]<dp[i][j-1]){
prev[i][j]=make_pair(i,j-1);
}
else{
prev[i][j]=make_pair(i-1,j);
}
}
fout << dp[n][m] << '\n';
pair<int,int> x=make_pair(n,m);
vector<int> rasp;
while(x.first!=0 and x.second!=0){
if(prev[x.first][x.second]==make_pair(x.first-1,x.second-1))
rasp.push_back(a[x.first]);
x=prev[x.first][x.second];
}
reverse(rasp.begin(),rasp.end());
for(int i=0;i<rasp.size();i++)
{
fout << rasp[i] << ' ';
}
return 0;
}