a=int(input())
h=a//3600
a=a%3600
m=a//60
s=a%60
if h>=10:
    print(h,end=':')
else:
    print(0,end='')
    print(h,end=':')

if m>=10:
    print(m,end=':')
else:
    print(0,end='')
    print(m,end=':')

if s>=10:
    print(s,end=':')
else:
    print(0,end='')
    print(s,end='')