s,v=input().split(" ") s=int(s) v=int(v) minute=10 hour=1 if s%v!=0: minute=minute+1+s//v else: minute=minute+s//v if minute>=60: minute-=60 hour+=1 time_minute=60-minute time_hour=8-hour if time_hour<=0: time_hour=32-hour if time_hour<10 and time_minute<10: print(f"0{time_hour}:0{time_minute}") elif time_hour<10 and time_minute>=10: print(f"0{time_hour}:{time_minute}") elif time_hour>=10 and time_minute>=10: print("f{time_hour}:{time_minute}") else: print("f{time_hour}:0{time_minute}") else: if time_minute<10: print("f0{time_hour}:0{time_minute}") else: print(f"0{time_hour}:{time_minute}")