h, m = map(int, raw_input().split(':'))
m += 5
h += m / 60
m = m % 60
h = h % 24
ansh = ''
if h < 10: ansh = ansh + '0'
ansh = ansh + str(h)
ansm = ''
if m < 10: ansm = ansm + '0'
ansm = ansm + str(m)
print ansh + ':' + ansm