hh, mm = map(int, input().split(":"))
r, mm = divmod(mm + 5, 60)
r, hh = divmod(hh + r, 24)
if mm <= 9:
    mm = '0' + str(mm)
else:
    mm = str(mm)
if hh <= 9:
    hh = '0' + str(hh)
else:
    hh = str(hh)
print(hh + ":" + mm)