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#include <bits/stdc++.h>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int dp[1030][1030];
int v[1030], a[1030];
int main()
{
int n, m;
fin >> m >> n;
for(int i=1; i <= m; i++)
fin >> a[i];
for(int j=1; j <= n; j++)
fin >> v[j];
for(int i=1; i <= m; i++)
{
for(int j=1; j <= n; j++)
{
if(a[i]==v[j])
dp[i][j]=dp[i-1][j-1]+1;
else
dp[i][j]=max(dp[i-1][j], dp[i][j-1]);
}
}
fout << dp[m][n] << '\n';
int i=m, j=n;
vector<int> rez;
while(i > 0 && j > 0)
{
if(a[i]==v[j])
{
rez.push_back(a[i]);
i--;
j--;
}
else if(dp[i-1][j] >= dp[i][j-1])
i--;
else
j--;
}
reverse(rez.begin(), rez.end());
for(auto I : rez)
fout << I << " ";
return 0;
}