a,b=[int(i) for i in input().split(":")]
c=b+5
if c>=60:
    a+=1
d=a%24
e=c%60

if (d<10) and (e<10):
    print("0"+str(d)+":0"+str(e))
elif (d<10):
    print("0"+str(d)+":"+str(e))
elif (e<10):
    print(str(d)+":0"+str(e))
else:
    print(str(d)+":"+str(e))