a = int(input())
b = int(a//100)
c = int((a-100*b)//10)
b = (b+10)%24
c = c*6
if b<10 and c<10:
    print("0",b,":","0",c,sep="")
elif b<10:
    print("0",b,":",c,sep="")
elif c<10:
    print(b,":","0",c,sep="")
else:
    print(b,c,sep=":")