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#include <fstream>
#define NMax 1030
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int a[NMax], b[NMax], d[NMax][NMax],n,m,best,sir[NMax],i,j;
int main()
{ f>>m>>n;
for(i=1;i<=m;i++)
f>>a[i];
for(j=1;j<=n;j++)
f>>b[j];
for(i=1;i<=m;i++)
for(j=1;j<=n;j++)
if(a[i]==b[j])
d[i][j]=1+d[i-1][j-1];
else d[i][j]=max(d[i-1][j],d[i][j-1]);
for(i=m,j=n;i;)
if(a[i]==b[j])
sir[++best]=a[i],--i,--j;
else if(d[i-1][j]<d[i][j-1])
--j;
else --i;
g<<best<<'\n';
for(i=best;i;--i)
g<<sir[i]<<' ';
return 0;
}