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#include <bits/stdc++.h>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int a[100],m,b[100],n,ab[100][100],v[100],k;
int main()
{
fin>>m;
fin>>n;
for(int i=1;i<=m;i++)
fin>>a[i];
for(int i=1;i<=n;i++)
fin>>b[i];
for (int i=1;i<=m;i++)
for(int j=1;j<=n;j++)
if (a[i]==b[j])
{
ab[i][j]=ab[i-1][j]+1;
v[k]=a[i];
k++;
}
else
ab[i][j]= max(ab[i-1][j],ab[i][j-1]);
fout<<ab[m][n]<<endl;
for(int i=0;i<k;i++)
fout<<v[i]<<" ";
return 0;
}