hh, mm = map(int, input().split(":"))
mm += 5
pl = 0
if mm >= 60:
    pl += 1
    mm %= 60

if pl == 1:
    hh += 1
    hh %= 24

hh = str(hh)
mm = str(mm)
if len(hh) == 1:
    hh = "0" + hh
if len(mm) == 1:
    mm = "0" + mm

print(hh + ":" + mm)