from datetime import datetime

with open(r'AInvestigation/data.txt', 'r') as input:
    lines = input.read().split('\n')[:-1]

day = 0

times = []

for line in lines:
    if line[0] == "=": 
        day+=1
        times.append({})
        continue
    date,time,_,_,name,part = line.split()
    times[day-1][(name,part[1])] = datetime.strptime(date+" "+time,"%Y-%m-%d %H:%M:%S")

for num,day in enumerate(times):
    best = [datetime.strptime("23:59:59","%H:%M:%S")-datetime.strptime("00:00:01","%H:%M:%S"),""]
    for name,part in day.keys():
        if part == '2':
            diff = [day[name,'2'] - day[name,'1'],name]
            best = min(best,diff, key=lambda x:x[0])
    print("Best difference of day "+str(num+1)+": "+str(best[0])+" (by "+best[1]+")")

# print(times)