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#include <bits/stdc++.h>
#define nmax 1050
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int a[nmax],b[nmax],n,m,best[nmax][nmax],sir[nmax];
void read()
{
fin>>n>>m;
for(int i=1;i<=n;i++)
fin>>a[i];
for(int j=1;j<=m;j++)
fin>>b[j];
}
void dp()
{
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
if(a[i]==b[j])
{
best[i][j]=best[i-1][j-1]+1;
sir[best[i][j]]=a[i];
}
else
best[i][j]=max(best[i-1][j],best[i][j-1]);
}
void solve()
{
dp();
fout<<best[n][m]<<"\n";
for(int i=1;i<=best[n][m];i++)
fout<<sir[i]<<" ";
}
int main()
{
read();
solve();
return 0;
}