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include <fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int a[1026],b[1026],c[1026][1026],i,j,n,m,x,v[1026];
int max(int a, int b){
if(a>b)
return a;
else
return b;
}
int main()
{
f>>n>>m;
for(i=1;i<=n;i++)
f>>a[i];
for(i=1;i<=m;i++)
f>>b[i];
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
if(a[i]==b[j])
c[i][j]=c[i-1][j-1]+1;
else
c[i][j]=max(c[i-1][j],c[i][j-1]);
g<<c[n][m]<<'\n';
x=c[n][m];
for(i=n;i>=2&&c[n][m]>0;i--)
for(j=m;j>=2&&c[n][m]>0;j--)
if(a[i]==b[j]){
v[c[n][m]]=a[i];
c[n][m]--;}
for(i=1;i<=x;i++)
g<<v[i]<<" ";
return 0;
}