---

#include <stdio.h>
#include <stdlib.h>

#define MAX_TEXT 101
#define MAX_LINE 101

int check_key(int argc, char *argv[]);
int read_data(int *width, char *text);
int str_len(char *str);
void remove_newline(char *text);
void skip_spaces(char *text, int *pos);
int word_len(char *text, int pos);
void flush_line(char *line, int *line_len, int *first_line);
void add_char(char *line, int *line_len, char c);
void add_word(char *line, int *line_len, char *text, int *pos, int len);
void split_word(char *line, int *line_len, int *first_line, char *text, int *pos, int width);
void process_word(char *line, int *line_len, int *first_line, char *text, int *pos, int width);
void print_text(char *text, int width);

int main(int argc, char *argv[]) {
    int width;
    char text[MAX_TEXT];

    if (!check_key(argc, argv) || !read_data(&width, text)) {
        printf("n/a");
    } else {
        print_text(text, width);
    }

    return 0;
}

int check_key(int argc, char *argv[]) {
    return argc == 2 && argv[1][0] == '-' && argv[1][1] == 'w' && argv[1][2] == '\0';
}

int read_data(int *width, char *text) {
    int result = 1;

    if (scanf("%d\n", width) != 1 || *width <= 1 || fgets(text, MAX_TEXT, stdin) == NULL) {
        result = 0;
    } else {
        remove_newline(text);
    }

    return result;
}

void print_text(char *text, int width) {
    int pos = 0;
    int line_len = 0;
    int first_line = 1;
    char line[MAX_LINE];

    skip_spaces(text, &pos);

    while (text[pos] != '\0') {
        process_word(line, &line_len, &first_line, text, &pos, width);
        skip_spaces(text, &pos);
    }

    flush_line(line, &line_len, &first_line);
}

void process_word(char *line, int *line_len, int *first_line, char *text, int *pos, int width) {
    int len = word_len(text, *pos);

    if (*line_len == 0) {
        if (len <= width) {
            add_word(line, line_len, text, pos, len);
        } else {
            split_word(line, line_len, first_line, text, pos, width);
        }
    } else if (*line_len + 1 + len <= width) {
        add_char(line, line_len, ' ');
        add_word(line, line_len, text, pos, len);
    } else if (len > width) {
        split_word(line, line_len, first_line, text, pos, width);
    } else {
        flush_line(line, line_len, first_line);
    }
}

void split_word(char *line, int *line_len, int *first_line, char *text, int *pos, int width) {
    if (*line_len > 0 && width - *line_len - 2 > 0) {
        int count = width - *line_len - 2;

        add_char(line, line_len, ' ');
        add_word(line, line_len, text, pos, count);
        add_char(line, line_len, '-');
        flush_line(line, line_len, first_line);
    } else if (*line_len > 0) {
        flush_line(line, line_len, first_line);
    }

    while (word_len(text, *pos) > width) {
        add_word(line, line_len, text, pos, width - 1);
        add_char(line, line_len, '-');
        flush_line(line, line_len, first_line);
    }

    add_word(line, line_len, text, pos, word_len(text, *pos));
}

void flush_line(char *line, int *line_len, int *first_line) {
    if (*line_len > 0) {
        if (!*first_line) {
            putchar('\n');
        }

        for (int i = 0; i < *line_len; i++) {
            putchar(line[i]);
        }

        *line_len = 0;
        *first_line = 0;
    }
}

void add_char(char *line, int *line_len, char c) {
    line[*line_len] = c;
    (*line_len)++;
}

void add_word(char *line, int *line_len, char *text, int *pos, int len) {
    for (int i = 0; i < len; i++) {
        add_char(line, line_len, text[*pos]);
        (*pos)++;
    }
}

void remove_newline(char *text) {
    int len = str_len(text);

    if (len > 0 && text[len - 1] == '\n') {
        text[len - 1] = '\0';
    }
}

int str_len(char *str) {
    int len = 0;

    while (str[len] != '\0') {
        len++;
    }

    return len;
}

void skip_spaces(char *text, int *pos) {
    while (text[*pos] == ' ') {
        (*pos)++;
    }
}

int word_len(char *text, int pos) {
    int len = 0;

    while (text[pos + len] != '\0' && text[pos + len] != ' ') {
        len++;
    }

    return len;
}