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Thousand Separator
Given an integer n, add a dot (".") as the thousands separator and return it in string format.
Given an integer n, add a dot (".") as the thousands separator and return it in string format.
Example 1
Input: n = 987
Output: "987"
Example 2
Input: n = 1234
Output: "1.234"
Constraints
- 0 <= n <= 231 - 1
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