#include <stdio.h>
#include <string.h>

#define MAX_REMIND 50
#define MSG_LEN 60

int read_line(char str[], int n);
int main(void) {
  char reminders[MAX_REMIND][MSG_LEN + 3];
  char day_str[3], msg_str[MSG_LEN + 1];
  int day, i, j, num_remind = 0;
  for (;;) {
    if (num_remind == MAX_REMIND) {
      printf("-- No space left --\n");
      break;
    }
    printf("Enter day and reminder: ");
    scanf("%2d", &day);
    if (day == 0)
      break;
    sprintf(day_str, "%2d", day);
    read_line(msg_str, MSG_LEN);
    for (i = 0; i < num_remind; i++)
      if (strcmp(day_str, reminders[i]) < 0)
        break;
    for (j = num_remind; j > i; j--)
      strcpy(reminders[j], reminders[j - 1]);
    strcpy(reminders[i], day_str);
    strcat(reminders[i], msg_str);
    num_remind++;
  }
  printf("\nDay Reminder\n");
  for (i = 0; i < num_remind; i++)
    printf(" %s\n", reminders[i]);
  return 0;
}

int read_line(char str[], int n) {
  int ch, i = 0;

  while ((ch = getchar()) != '\n') {
    if (i < n) {
      str[i++] = ch;
    }
  }
  str[i] = '\0';
  return i;
}
