小南解题-时间显示--195ms，151ms

'''

2022-03-21 15:51:34

zgn946

'''

#方法1，简便，大佬写，195ms

t = int(input())

s = t//1000

ss = s%60

m = s//60

mm = m%60

h = m//60

hh = h%24

print('{:0>2d}:{:0>2d}:{:0>2d}'.format(hh,mm,ss))

'''

#方法二，小南写，151ms

a=int(input())

a=a//1000

if a>86400:

    a=a%86400

if a==86400 or a==0:

    print('00:00:00')

elif a==3600:

    print('01:00:00')

elif a==60:

    print('00:01:00')

if a>3600:

    h=a//3600

    m=(a-h*3600)//60

    s=(a-h*3600-m*60)

elif 60<a<3600:

    m=a//60

    s=a-h*60

    h=0

elif 0<a<60:

    h=m=0

    s=a

print('{:0>2d}:{:0>2d}:{:0>2d}'.format(h,m,s))

'''