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#include <fstream>
using namespace std;
ifstream f ("cmlsc.in");
ofstream g ("cmlsc.out");
const int nmax=1e3+3;
int n,m,a[nmax],b[nmax],d[nmax][nmax],sol[nmax],k;
int main()
{
f>>n>>m;
for(int i=1;i<=n;++i) f>>a[i];
for(int i=1;i<=m;++i) f>>b[i];
for(int i=1;i<=n;++i)
{
for(int j=1;j<=m;++j)
{
d[i][j]=max(d[i-1][j],d[i][j-1]);
if(a[i]==b[j]) d[i][j]=d[i-1][j-1]+1;
}
}
g<<d[n][m]<<'\n';
while(n&&m)
{
if(a[n]==b[m])
{
sol[++k]=a[n];
--n;
--m;
continue;
}
if(d[n-1][m]>d[n][m-1]) --n;
else --m;
}
for(int i=k;i>=1;--i) g<<sol[i]<<' ';
return 0;
}