#include <iostream>

#define MAXN 100000
#define MAXW 21

using namespace std;

int N, K, i;

int main() {
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
    cin>>N;
    cin>>K;
    string W[N];
    for(i=0; i<N; i++)
        cin>>W[i];
    int con=0;
    for(i=0; i<N; i++){
        if(con+sizeof(W[i])<K){
            cout<<W[i]<<" ";
            con=1+con+sizeof(W[i]);
        }else{
            cout<<endl<<W[i]<<" ";
            con=1+sizeof(W[i]);
        }
    }
    return 0;
}