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