#include <fstream.h>
#include <string.h>
#include <stream.h>
#include <stdlib.h>
#include <iostream.h>
#include <strings.h>
#include <stdio.h>

ifstream in("average.in");



int main () {
  int runs;
  float dist;
  in >> runs;
  in >> dist;

  while (1) {
    int teamNum;
    int disq = 0;
    int aktSek = 0;

    in >> teamNum;
    for (int i = 0; i < runs; i++) {
      char timeStr[50];
      in >> timeStr;
      if (!in) return 0;

      // die Zeiten aufdröseln
      int h,m,s;
      if (timeStr[0] == '-') disq = 1; else {
        timeStr[1] = 0;
        timeStr[4] = 0;
        h = atoi(timeStr);
        m = atoi(&(timeStr[2]));
        s = atoi(&(timeStr[5]));

        aktSek += h*60*60 + m*60 + s;
      }
    }

    // Team ausgeben
    printf("%3d: ",teamNum);

    // Jetzt den Durchschnitt berechnen
    if (disq) cout << "-" << endl; else {
      // Jetzt den Schnitt ausrechnen
      float schnitt = (float)aktSek;
      schnitt = schnitt / dist;
      int sek = (int) (schnitt+0.5);
      int min = sek / 60;
      sek = sek % 60;
      cout << min << ":";
      if (sek < 10) cout << "0";
      cout << sek << " min/km" << endl;
    }
  }
  return 0;
}