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#include <bits/stdc++.h>
using namespace std;
ifstream in("cmlsc.in");
ofstream out("cmlsc.out");
int n,m,a[1050],b[1050],dp[1050][1050];
vector<int> sol;
int main()
{
in >> n >> m;
for(int i=1; i<=n; i++)
in >> a[i];
for(int i=1; i<=m; i++)
in >> b[i];
for(int i=1; i<=n; i++)
{
for(int j=1; j<=m; j++)
{
if(a[i]==b[j]) dp[i][j]=dp[i-1][j-1]+1;
else dp[i][j]=max(dp[i-1][j],dp[i][j-1]);
}
}
for(int i=n, j=m; i&&j;)
{
if(a[i]==b[j])
{
sol.push_back(a[i]);
i--;
j--;
}
else if(dp[i-1][j]>dp[i][j-1])
i--;
else
j--;
}
out << sol.size() << '\n';
for(int i=sol.size()-1; i>=0; i--)
out << sol[i] << ' ';
return 0;
}