1
# Runtime: 17 ms (Top 24.0%) | Memory: 13.24 MB (Top 48.1%)
2

3

4
class Solution(object):
5
    def thousandSeparator(self, n):
6
        """
7
        :type n: int
8
        :rtype: str
9
        """
10
        n = str(n)
11
        if len(n) <= 3:
12
            return str(n)
13
        result = ""
14
        dot = "."
15
        index = 0
16
        startPos = len(n) % 3
17
        if startPos == 0:
18
            startPos += 3
19
        val = -1
20
        while index < len(n):
21
            result += n[index]
22
            if index == startPos - 1:
23
                result += dot
24
                val = 0
25
            if val != -1:
26
                val += 1
27
                if val > 3 and (val - 1) % 3 == 0 and index != len(n) - 1:
28
                    result += dot
29
                    val = 1
30
            index += 1
31

32
        return result