#include <iostream>
#include <cstring>
#include <algorithm>
using namespace std;
int main()
{
int n,k;
cin>>n>>k;
int len = k;
string s;
for(int i = 1;i <= n;i++){
cin>>s;
if(s.size() <= len){
cout<<s<<" ";
len -= s.size();
}else{
cout<<endl;
cout<<s<<" ";
len = k - s.size();
}
}
return 0;
}