hh,mm = map(int,input().split(':'))

mm += 5
hh += mm // 60
hh %= 24
mm %= 60

hh = str(hh)
hh = '0'*(2-len(hh))+hh
mm = str(mm)
mm = '0'*(2-len(mm))+mm
print(hh+':'+mm)