import json
import sys

if __name__ == '__main__':
    #sys.stdin = open('in.txt', 'r')
    n = int(input())

    l = []

    for i in range(n):
        l.append(input())

    y = json.loads(l[0])

    nbcit = 0
    dicPub = {}
    dicPubValues = {}
    pub_one = json.loads(l[0])

    for i in pub_one['publications']:
        # print(i)
        dicPub[i['publicationNumber']] = i['publicationTitle']
        year_list = i['articleCounts']
        for j in year_list:
            #  print(j)
            if int(j['year']) == 2017 or int(j['year']) == 2018:
                if i['publicationNumber'] not in dicPubValues.keys():
                    dicPubValues[i['publicationNumber']] = 0
                dicPubValues[i['publicationNumber']] += int(j['articleCount'])

    dicCit = {}
    for i in range(1, n):
        y = json.loads(l[i])
        o = y["paperCitations"]
        for i in o['ieee']:
            # print(i)
            if int(i['year']) == 2017 or int(i['year']) == 2018:
                if i['publicationNumber'] not in dicCit.keys():
                    dicCit[i['publicationNumber']] = 0
                dicCit[i['publicationNumber']] += 1

    # print(dicCit)
    #  print(dicPub)
    #  print(dicPubValues)

    finalList = []
    for key in dicPubValues.keys():
        x = (dicCit[key] / dicPubValues[key])
        s = (dicPub[key], round(x, 2))
        #   s = ('{}: {:.2f}'.format(dicPub[key], round(x, 2)))
        touched = False
        if len(finalList) == 0:
            finalList.insert(0, s)
        else:
            for i, value in enumerate(finalList):
                if value[1] <= s[1]:
                    finalList.insert(i, s)
                    touched = True
                    break

            if not touched:
                finalList.append(s)


                #  finalList.append(s)

    for s in finalList:
        print("{}: {:.2f}".format(s[0] , s[1]))