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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int m, n, a[1025], b[1025], c;
int main() {
f >> m >> n;
for (int i = 0; i < m; i++) {
f >> a[i];
}
for (int i = 0; i < n; i++) {
f >> b[i];
}
int v[1025];
for (int i = 0; i < m; i++) {
for (int j = 0; j < n; j++) {
if (a[i] == b[j]) {
if (c == 0) {
v[c++] = j;
}
else {
if (j > v[c - 1]) v[c++] = j;
}
}
}
}
g << c << '\n';
for (int i = 0; i < c; i++) {
g << b[v[i]] << ' ';
}
}