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#include <fstream>
#define max(a,b) a>b ? a:b
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
void citire(int *v,int n)
{
for(int i=0;i<n;++i)
f>>v[i];
}
int main()
{
int n,m,a[1024],b[1024],d[1024][1024]={0};
f>>n>>m;
citire(a,n);
citire(b,m);
for(int i=1;i<=n;++i)
for(int j=1;j<=m;++j)
{
if(a[i-1]==b[j-1])
d[i][j]=d[i-1][j-1]+1;
else
d[i][j]=max(d[i-1][j],d[i][j-1]);
}
g<<d[n][m]<<'\n';
int k=0,v[1024];
for(int i=n,j=m;j;)
{
if(a[i-1]==b[j-1])
v[k++]=a[i-1],--i,--j;
else if(a[i-1]<b[j-1])
--j;
else
--i;
}
for(int i=k-1;i>=0;--i)
g<<v[i]<<' ';
return 0;
}