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def solution(book_time):
    answer = 0
    book_time_int=[]

    for start,end in book_time:
        book_time_int.append([int(start[:2])*60+int(start[3:]),1])
        book_time_int.append([int(end[:2])*60+int(end[3:])+10,0])
    book_time_int.sort()

    now=0
    for time in book_time_int:
        if time[1]==1:
            now+=1
        else :
            now-=1
        answer=max(answer,now)

    return answer