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#include<bits/stdc++.h>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int ans[1025];
int main() {
int n, m;
fin >> n >> m;
vector<int> a(n + 1);
vector<int> b(m + 1);
for(int i = 1; i <= n; i++){
fin >> a[i];
}
for(int i = 1; i <= m; i++){
fin >> b[i];
}
int dp[n + 1][m + 1];
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];
}
else{
dp[i][j] = max(dp[i - 1][j], dp[i][j - 1]);
}
}
}
int i = n, j = m;
while(i != 0 && j != 0){
if(a[i] == b[j]){
ans[++cnt] = a[i];
i--;
j--;
}
else if(a[i - 1][j] < a[i][j - 1]){
j--;
}
else{
i--;
}
}
fout << cnt << '\n';
for(int i = cnt; i >= 1; i++){
fout << ans[i] << " ";
}
return 0;
}