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#include <bits/stdc++.h>
#define nmax 1050
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int a[nmax],b[nmax],n,m,best[nmax][nmax],sir[nmax];
void read()
{
fin>>n>>m;
for(int i=1;i<=n;i++)
fin>>a[i];
for(int j=1;j<=m;j++)
fin>>b[j];
}
void dp()
{
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
if(a[i]==b[j])
{
best[i][j]=best[i-1][j-1]+1;
}
else
best[i][j]=max(best[i-1][j],best[i][j-1]);
}
void solve()
{
dp();
fout<<best[n][m]<<"\n";
int i=n,j=m,l=1;
while(best[i][j]!=0)
{
if(a[i]==b[j])
{
sir[l++]=a[i];
i--;
j--;
}
else if (a[i-1]>b[j-1])
i--;
else
j--;
}
for(int i=l-1;i>=1;i--)
fout<<sir[i]<<" ";
}
int main()
{
read();
solve();
return 0;
}