#include <iostream>
#include <string>
#include <cmath>
#include <algorithm>
#define task "word"
#define ld long double
#define ll long long
#define ull unsigned long long

using namespace std;
const int sizearr = 100003;

string s[101];
int n, k, cnt, j = 1;

inline void fastIOfileinput(){
    ios_base:: sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    if(fopen(task".inp", "r")){
        freopen(task".inp", "r", stdin);
        freopen(task".out", "w", stdout);
    }
    if(fopen(task".in", "r")){
        freopen(task".in", "r", stdin);
        freopen(task".out", "w", stdout);
    }
}

inline void subtask(){
    ;
}

int main(){
    fastIOfileinput();
    cin >> n >> k;
    for(int i = 1; i <= n; ++i){
        cin >> s[i];
        cnt += s[i].length();
        if(cnt > k){
            for(int t = j; t < i; ++t) cout << s[t] << (t == i - 1 ? "\n" : " ");
            j = i;
            cnt = s[i].length();
        }
    }
    if(cnt <= k){
        for(int t = j; t <= n ; ++t) cout << s[t] << (t == n ? "" : " ");
    }
}