#include<iostream>
#include <math.h>
#include<string>
using namespace std;

int round(double a){
	if(a - floor(a) >= 0.5){
		a = (int)(a + 1);
	}
	return a;
}

int main(){
	int n1, n2;//n2是队伍号码
	string n4;//n4是时间
	int total;
	int flag;
	double n3;
	cin>>n1>>n3;//n1是接力人数，n3是公里数
	while(cin>>n2){//处理每一队的数据
		total = 0;
		cout.width(3);
		cout<<n2<<": ";	
		flag = 0;
		for(int i = 0; i < n1; i++){
			cin>>n4;
			if(n4 != "-:--:--"){
				total+=(int)(n4[6] - 48);
				total+=((int)(n4[5] - 48)) * 10;
				total+=((int)(n4[3] - 48)) * 60;
				total+=((int)(n4[2] - 48)) * 600;
				total+=((int)(n4[0] - 48)) * 3600;
			}else{
				flag = 1;
				cout<<"-"<<endl;
				if(i != n1 - 1){
					string s1;
					getline(cin, s1);
					break;
				}
			}
		}
		if(flag == 1){
			continue;
		}
		total = round(total / n3);
		int t1, t2, t3, t4, t5;
		t1 = total / 3600;
		if(t1){
			cout<<t1<<":";
			total %= 3600;
		}
		t2 = total / 600;
		if(t2){
			cout<<t2;
			total %= 600;
		}else if(t1){
			cout<<t2;
			total %= 600;
		}

		t3 = total / 60;
		cout<<t3;
		if(t3){
			total %= 60;
		}
		cout<<":";

		t4 = total /10;
		cout<<t4;
		if(t4){
			total %= 10;
		}

		t5 = total;
		cout<<total;

		cout<<" min/km"<<endl;
	}
}