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#include <fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int n,m,a[1025],b[1025],d[1025][1025],rez[1025],ct=0;
int maxim(int a,int b)
{
if(a>b) return a;
else return b;
}
int main()
{
f>>n>>m;
int i,j;
for(i=1;i<=n;i++)
f>>a[i];
for(i=1;i<=m;i++)
f>>b[i];
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
{
if(a[i]==b[j]) d[i][j]=d[i-1][j-1]+1;
else d[i][j]=maxim(d[i-1][j],d[i][j-1]);
}
g<<d[n][m]<<'\n'; i=n;j=m;
while(i&&j)
if(a[i]==b[j])
{
rez[++ct]=a[i];
i--; j--;
}
else if (d[i-1][j]>d[i][j-1]) i--;
else j--;
for(i=ct;i;i--)
g<<rez[i]<<' ';
}