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