# -*- coding: utf-8 -*-
"""

"""

def ask_times():
    times = []
    inp = '1'
    while (0<len(inp)):
        print('Введите время: ', end='')
        inp = input()
        if 0<len(inp):
            times.append(inp)
    return times

def sec_from_time(stime):
    parts = stime.split(sep=':')
    parts.reverse()
    level = 1
    ret = 0
    for part in parts:
        c = int(part)
        ret += c * level
        level *= 60
    return ret

def time_from_sec(sec):
    parts = []
    parts.append('{:02d}'.format(sec % 60))
    d = int(sec/60)
    while(d):
        parts.append('{:02d}'.format(d % 60))
        d = int(d/60)
    parts.reverse()
    return ':'.join(parts)

times    = ask_times()
sum_sec  = sum(map(sec_from_time, times))
sum_time = time_from_sec(sum_sec)

print('Список: ', times)
print('Итого: {0} / {1}'.format(sum_time, sum_sec))