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#include <iostream>
#define NM 1025
#include <fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int a[NM],b[NM],lg[NM][NM],d[NM][NM],n,m;
void afisare(int i,int j)
{
if(i>0 && j>0)
{
if(d[i][j]==1)
{
afisare(i-1,j-1);
fout<<a[i]<<' ';
}
else if(d[i][j]==2)
{
afisare(i,j-1);
}
else
{
afisare(i-1,j);
}
}
}
int main()
{
int i,j;
fin>>n>>m;
for(i=1; i<=n; i++)
fin>>a[i];
for(j=1; j<=m; j++)
fin>>b[j];
for(i=1; i<=n; i++)
for(j=1; j<=m; j++)
if(a[i]==b[j])
{
lg[i][j]=lg[i-1][j-1]+1;
d[i][j]=1;
}
else
{
if(lg[i-1][j]<lg[i][j-1])
{
lg[i][j]=lg[i][j-1];
d[i][j]=2;
}
else
{
lg[i][j]=lg[i-1][j];
d[i][j]=3;
}
}
fout<<lg[n][m]<<'\n';
afisare(n,m);
}