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#include <bits/stdc++.h>
using namespace std;
ifstream fin ("cmlsc.in");
ofstream fout ("cmlsc.out");
int n, m, v[1030][1030], a[1030], b[1030], rez[1030], cnt;
void invers (int i , int j)
{
if (i && j)
{
if (a[i] == b[j])
{
invers(i - 1, j - 1);
fout << a[i] << ' ';
}
else if (v[i - 1][j] < v[i][j - 1])
invers(i, j - 1);
else
invers(i - 1, j);
}
}
int main()
{
fin >> n >> m;
for (int i = 1; i <= n; i ++) fin >> a[i];
for (int i = 1; i <= m; i ++) fin >> b[i];
for (int i = 1; i <= n; i ++)
{
for (int j = 1; j <= m; j ++)
{
if (a[i] == b[j]) v[i][j] = v[i - 1][j - 1] + 1;
else
v[i][j] = max(v[i - 1][j], v[i][j - 1]);
}
}
fout << v[n][m] << '\n';
invers(n, m);
return 0;
}