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#include <iostream>
#include<fstream>
#define len 1024
#define maxim(a,b) ((a>b)? a:b)
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int sol[len][len], v1[len], v2[len], fin[len],k,n,m;
void citire()
{
f>>n>>m;
for(int i=1;i<=n;i++)
f>>v1[i];
for(int i=1;i<=m;i++)
f>>v2[i];
}
void verificare()
{
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
if(v1[i]==v2[j])
sol[i][j]=1+sol[i-1][j-1];
else
sol[i][j]=maxim(sol[i-1][j],sol[i][j-1]);
}
void parcurgere()
{
int i=n,j=m;
while(i>0&&j>0)
{
if(v1[i]==v2[j])
fin[++k]=v1[i],i--,j--;
else if(sol[i-1][j]>sol[i][j-1])
i--;
else j--;
}
}
void afisare()
{
g<<k<<endl;
for(int i=k;i>=1;i--)
g<<fin[i]<<" ";
}
int main()
{
citire();
verificare();
parcurgere();
afisare();
return 0;
}