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#include <bits/stdc++.h>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int a[1025],b[1025],c[1025][1025],s[1025];
int main()
{
int n,m,k=0;
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=1;i<=n;i++)
for(int j=1;j<=m;j++)
if(a[i]==b[j])
c[i][j]=c[i-1][j-1]+1;
else
{
if(c[i-1][j]>c[i][j-1])
c[i][j]=c[i-1][j];
else
c[i][j]=c[i][j-1];
}
fout<<c[n][m]<<'\n';
while(c[n][m])
{
if(a[n]==b[m])
{
k++;
s[k]=a[n];
n--;
m--;
}
else
{
if(c[n-1][m]>c[n][m-1])
n--;
else
m--;
}
}
while(k)
{
fout<<s[k]<<" ";
k--;
}
return 0;
}