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#include<fstream>
#define NMAX 1025
using namespace std;
short int n,m, a[NMAX], b[NMAX], d[NMAX][NMAX], sir[NMAX], index=0;
int main()
{
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
f>>n>>m;
for(int i=1;i<n+1;i++)
f>>a[i];
for(int i=1;i<m+1;i++)
f>>b[i];
for(int i=1;i<n+1;i++)
for(int j=1;j<m+1;j++)
{
if(a[i]==b[j])
d[i][j]=1+d[i-1][j-1];
else
d[i][j]=max(d[i][j-1],d[i-1][j]);
}
for(int i=n, j=m; i!=0; )
{
if(a[i]==b[j])
{ sir[index++] = a[i];i--;j--;}
else if(d[i-1][j]<d[i][j-1])
j--;
else
i--;
}
g<<index<<'\n';
for(int i=index-1;i>=0;i--)
g<<sir[i]<<' ';
f.close();g.close();
return 0;
}