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#include <iostream>
#include <fstream>
#define NMAX 1024
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int n,m,a[NMAX],b[NMAX],i,c[NMAX][NMAX],j;
void afis(int i,int j)
{
if(i>=1 && j>=1)
if(a[i]!=b[j])
{if(c[i][j-1]>c[i-1][j]) afis(i,j-1);
else afis(i-1,j);}
else
{
afis(i-1,j-1);
g<<a[i]<<" ";
}
}
int main()
{f>>n>>m;
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]) c[i][j]=c[i-1][j-1]+1;
else c[i][j]=max(c[i-1][j],c[i][j-1]);
g<<c[n][m]<<endl;
afis(n,m);
f.close();
g.close();
return 0;
}