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#include <fstream>
#define maxi(a, b) ((a > b) ? a : b)
#define NMAX 1028
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int m,n,a[NMAX],b[NMAX],c[NMAX][NMAX],v[NMAX];
int main()
{
f>>m>>n;
for(int i=1;i<=m;i++)
f>>a[i];
for(int i=1;i<=n;i++)
f>>b[i];
for(int i=0;i<m;i++)
c[i][0]=0;
for(int j=0;j<n;j++)
c[0][j]=0;
for(int i=1;i<=m;i++)
for(int j=1;j<=n;j++)
{
if(a[i]==b[j])
c[i][j]=c[i-1][j-1]+1;
else
c[i][j]=maxi(c[i-1][j], c[i][j-1]);
}
g<<c[m][n]<<'\n';
int ct=0;
for(int i=m,j=n;i;)
{
if(a[i]==b[j])
{
v[++ct]=a[i];
i--;
j--;
}
else if(c[i-1][j]>c[i][j-1])
i--;
else
j--;
}
for(int i=ct;i>=1;i--)
g<<v[i]<<" ";
return 0;
}