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#include <iostream>
#include <vector>
#include <fstream>
using namespace std;
int dp[1030][1030];
int main() {
int n, m;
vector<int> v;
vector<int> w;
ifstream fin ("cmlsc.in");
ofstream fout ("cmlsc.out");
int x;
fin >> n >> m;
v.push_back(0);
w.push_back(0);
for (int i = 0; i < n; i++) {
fin >> x;
v.push_back(x);
}
for (int i = 0; i < m; i++) {
fin >> x;
w.push_back(x);
}
for (int i = 1; i <= n; i++) {
for (int j = 1; j <=m; j++) {
dp[i][j] = max(dp[i - 1][j], dp[i][j - 1]);
if (v[i] == w[j]) {
dp[i][j] = dp[i - 1][j - 1] + 1;
}
}
}
fout << dp[n][m] << endl;
int res = dp[n][m];
int i_pos = n;
int j_pos = m;
vector<int> sol;
while (res > 0) {
if (v[i_pos] == w[j_pos]) {
res--;
sol.push_back(v[i_pos]);
i_pos = i_pos - 1;
j_pos = j_pos - 1;
} else {
if (dp[i_pos][j_pos - 1] > dp[i_pos - 1][j_pos]) {
j_pos--;
} else {
i_pos--;
}
}
}
for (int i = sol.size() - 1; i >= 0; i--) {
fout << sol[i] << " ";
}
fout << endl;
fin.close();
fout.close();
return 0;
}