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#include <bits/stdc++.h>
#define NMAX 1024
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int a[NMAX+1],b[NMAX+1],lis[NMAX+1][NMAX+1],n,m,sol[NMAX];
void Citire()
{
int i;
fin>>n>>m;
for(i=1;i<=n;i++)
fin>>a[i];
for(i=1;i<=m;i++)
fin>>b[i];
}
void Rezolvare()
{
int i,j,maxim,nsol;
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
if(a[i]==b[j])
lis[i][j]=lis[i-1][j-1]+1;
else lis[i][j]=max(lis[i-1][j],lis[j][i-1]);
maxim=nsol=0;
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
maxim=max(maxim,lis[i][j]);
fout<<maxim<<"\n";
i=n;
j=m;
while(i && j)
{
if(a[i]==b[j])
{
sol[++nsol]=a[i];
i--;
j--;
}
else if(lis[i-1][j]>lis[i][j-1])
i--;
else
j--;
}
for(i=nsol;i>=1;i--)
fout<<sol[i]<<" ";
fout<<"\n";
}
int main()
{
Citire();
Rezolvare();
return 0;
}