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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int matrice[2000][2000];
void afisare(int i, int j, int a[], int b[])
{
if(matrice[i][j]!=0)
{
if(matrice[i-1][j]==matrice[i][j-1]&&a[i]==b[j])
{
afisare(i-1,j-1,a,b);
fout<<a[i]<<" ";
}
else switch(matrice[i-1][j]>matrice[i][j-1])
{
case 1:
afisare(i-1,j,a,b);
case 0:
afisare(i,j-1,a,b);
}
}
}
int main()
{
int n, m, a[2000],b[2000];
fin>>n>>m;
for(int i=1;i<=n;i++)
{
fin>>a[i];
}
for(int i=1;i<=m;i++)
{
fin>>b[i];
}
for(int i=0;i<=n;i++)
for(int j=0;j<=m;j++)
matrice[i][j]=0;
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
{
if(a[i]==b[j])
{
matrice[i][j]=matrice[i-1][j-1]+1;
}
else
{
matrice[i][j]=max(matrice[i-1][j],matrice[i][j-1]);
}
}
fout<<matrice[n][m]<<'\n';
afisare(n,m,a,b);
return 0;
}