s=input()
m=len(s)
ans=""

if m <= 3:
    print(s)
elif m <= 6:
    a=s[:-3]
    b=s[-3:]
    ans = "," + b
    print(a + ans)
elif m <= 9:
    a=s[-6:-3]
    b=s[-3:]
    c=s[:-6]
    ans1 = "," + b
    ans2 = "," + a
    print(c + ans2 + ans1)
else:
    print("1,000,000,000")