#include <iostream>
#include <vector>
#include <string>
#include <algorithm>

using namespace std;

struct page {
  vector<string> p;
  int column, row;
  int cnum, cspace, width;
  page(int plen, int _cnum, int _width, int _cspace)
    : p(plen, ""), column(0), row(0), cnum(_cnum), width(_width), cspace(_cspace) {}

  void add_space() {
    for (int i = 0; i < p.size(); i++) { p[i] += string(cspace, '.'); }
  }

  void fill_column() {
    if (row == 0) { return; }
    for (; row < p.size(); row++) { p[row] += string(width, '.'); }
    row = 0; column++;
  }

  void print() {
    // Something wrong
    while (column < cnum) {
      add_chopped_string(""); fill_column();
    }
    for (int i = 0; i < p.size(); i++) {
      cout << p[i] << endl;
    } cout << "#" << endl;
  }

  void clear() {
    p = vector<string>(p.size(), "");
  }

  void add_chopped_string(const string &s) {
    if (column > 0 && row == 0) { add_space(); }
    p[row] += (s + string(width - s.length(), '.'));
    row++;
    if (row >= p.size()) { row = 0; column++; }
    if (column >= cnum) { print(); clear(); column = 0; }
  }

  void add_string(const string &s) {
    if (s == "") { add_chopped_string(""); }
    for (int i = 0; i < s.length(); i += width) {
      add_chopped_string(s.substr(i, min(width, (int)(s.length() - i))));
    }
  }

};

int main()
{
  int plen, cnum, width, cspace;
  string s;

  while (cin >> plen && plen > 0) {
    cin >> cnum >> width >> cspace;
    page p(plen, cnum, width, cspace);
    getline(cin, s); // dummy

    while (true) {
      getline(cin, s); if (s == "?") { break; }
      p.add_string(s);
    }
    if (p.row > 0 || p.column > 0) { p.fill_column(); p.print(); }
    cout << "?" << endl;
  }
  return 0;
}