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#include <iostream>
#include <fstream>
using namespace std;
ifstream inf("cmlsc.in");
ofstream oinf("cmlsc.out");
int main()
{
int a[1024],b[1024],n,m,x[1024],sol=0,c[1024][1024];
inf>>n>>m;
for(int i=1;i<=n; i++) {inf>>a[i];c[0][i]=0;}
for(int i=1;i<=m; i++) {inf>>b[i];c[i][0]=0;}
for(int i=1;i<=n; i++)
for(int j=1;j<=m; j++){
if(a[i]==b[j])
c[i][j]=1+c[i-1][j-1];
else
c[i][j]= max(c[i-1][j],c[i][j-1]);
}
for(int i=n;i;)
for(int j=m;j;){
if(a[i]==b[j])
x[++sol]=a[i];
else if(c[i-1][j]>c[i][j-1])
i--;
else
j--;
}
oinf<<c[n][m]<<"\n";
for(int i=1;i<=c[n][m];i++)
oinf<<x[i]<<" ";
return 0;
}