import math
s,v=map(float,input().split())
t=math.ceil(s/v)+10
if math.ceil(s/v)==0:
t=t+1
m=0
while t>=60:
t=t-60
m=m+1
if t>0:
f=8-m-1
n=60-t
else:
f=8-m
n=0
while f<0:
f=f+24
if f>10:
if n>10:
print("%.f:%.f" %(f,n))
else:
print("%.f:0%.f" % (f, n))
else :
if n > 10:
print("0%.f:%.f" % (f, n))
else:
print("0%.f:0%.f" % (f, n))
