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#include <bits/stdc++.h>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int a[1050], b[1050], lcs[1050][1050];
int n, m;
int t[1050], k;
void Citire()
{
int i;
fin >> n >> m;
for(i = 1; i <= n; i++)
fin >> a[i];
for(i = 1; i <= m; i++)
fin >> b[i];
}
void LCS()
{
int i, j;
for(i = 1; i <= n; i++)
for(j = 1; j <= m; j++)
if(a[i] == b[j])
lcs[i][j] = lcs[i - 1][j - 1] + 1;
else
lcs[i][j] = max(lcs[i - 1][j], lcs[i][j - 1]);
fout << lcs[n][m] << "\n";
}
void Afisare(int i, int j)
{
if(i <= 1 && j <= 1)
return;
else
if(a[i] == b[j])
{
Afisare(i - 1, j - 1);
fout << a[i] << " ";
}
else if (lcs[i][j - 1] > lcs[i - 1][j]) Afisare(i, j - 1);
else Afisare(i - 1, j);
}
int main()
{
Citire();
LCS();
Afisare(n, m);
return 0;
}