h, m = map(int, input().split(':'))

m += 5
if m >= 60:
    h += 1
    m -= 60

result = ''
if h == 24:
    result += '00'
elif h < 10:
    result += '0' + str(h)
else:
    result += str(h)

result += ':'

if m < 10:
    result += '0' + str(m)
else:
    result += str(m)

print(result)