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#include <iostream>
#include <string>
#include <vector>
#include "random.h"
class LineAccumulator {
public:
LineAccumulator(const std::size_t max_length):
max_length_{max_length},
random_{},
length_{0},
tokens_{},
spaces_{} { }
~LineAccumulator() {
this->discharge(false);
}
void operator()(const std::string& word) {
if ( ( this->length_ + word.length() + 1 ) > this->max_length_ ) {
this->pop_trailing_token();
this->discharge(true);
}
this->add_token(word);
this->add_space();
}
private:
const std::size_t max_length_;
utility::Random random_;
std::size_t length_;
std::vector<std::string> tokens_;
std::vector<std::size_t> spaces_;
void add_token(const std::string& token) {
this->length_ += token.length();
this->tokens_.emplace_back(token);
}
void add_space() {
this->add_token(" ");
this->spaces_.emplace_back(this->tokens_.size() - 1);
}
void increase_space_at(const std::size_t index) {
this->tokens_.at(this->spaces_[index]).append(" ");
++this->length_;
}
void pop_trailing_token() {
this->length_ -= this->tokens_.back().length();
this->tokens_.pop_back();
this->spaces_.pop_back();
}
void discharge(const bool full) {
if ( full ) {
auto range = this->random_.makeRange(0, this->spaces_.size()-1);
while ( this->length_ < this->max_length_ ) {
this->increase_space_at(range.get());
}
}
for ( const auto& token : this->tokens_ ) {
std::cout << token;
}
std::cout << '\n';
this->length_ = 0;
this->tokens_.clear();
this->spaces_.clear();
}
};
int main() {
std::cout.sync_with_stdio(false);
std::cin.sync_with_stdio(false);
LineAccumulator acc{60};
std::string word;
while ( std::cin >> word ) {
acc(word);
}
}
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