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#include <bits/stdc++.h>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int n, m, v1[1030], v2[1030], dp[1030][1030], ans[1030], ind;
int main() {
fin >> n >> m;
for(int i = 1; i <= n; i++) {
fin >> v1[i];
}
for(int i = 1; i <= m; i++) {
fin >> v2[i];
}
fin.close();
for(int i = 1; i <= n; i++) {
for(int j = 1; j <= m; j++) {
if(v1[i] == v2[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(v1[n] == v2[m]) {
ans[++ind] = v1[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 << ans[i] << " ";
}
return 0;
}