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#include <bits/stdc++.h>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int a[1026],b[1026],dp[1026][1026],M,N,L;
int main()
{ fin>>M>>N;
for(int i=1;i<=M;i++)
{
fin>>a[i];
}
for(int i=1;i<=N;i++)
{
fin>>b[i];
}
vector<int> sol;
for(int i=1;i<=M;i++)
{
for(int j=1;j<=N;j++)
{
if(a[i]==b[j])
{dp[i][j]=dp[i-1][j-1]+1;
sol.push_back(a[i]);
}
else
dp[i][j]=max(dp[i-1][j],dp[i][j-1]);
}
}
fout<<dp[M][N]<<endl;
for(auto i:sol)
fout<<i<<" ";
return 0;
}