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#include <iostream>
#include <fstream>
using namespace std;
#define maxim(a,b) ((a>b) ? a : b)
#define nr 5000
int m,n,a[nr],b[nr],c[nr][nr],bst,sir[nr];
int main()
{
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
f>>m>>n;
int i,j;
for(i=1;i<=m;i++)
f>>a[i];
for(i=1;i<=n;i++)
f>>b[i];
for(i=1;i<=m;i++)
for(j=1;j<=n;j++)
if(a[i]==b[j])
c[i][j]=1+c[i-1][j-1];
else
c[i][j]=maxim(c[i-1][j],c[i][j-1]);
i=m;
j=n;
while(i&&j)
{
if(a[i]==b[j])
{
sir[++bst]=a[i];
--j;
--i;
}
else
if(c[i-1][j]<c[i][j-1])
--j;
else
--i;
}
g<<bst<<endl;
for(i=bst;i>=1;i--)
g<<sir[i]<<" ";
}