Formatting Numbers with Commas

Your task is to insert commas as thousands separators into a given non-empty string representing a number.

For instance, the number 1234567 should be formatted as 1,234,567.
Make sure your solution correctly handles both small and large numbers.

For example, given the input 1000, the output should be 1,000.

inputFormat

A single non-empty string of digits representing a number is read from standard input (stdin).

outputFormat

Output the formatted number as a string with commas inserted as thousand separators to standard output (stdout).## sample

1234567

1,234,567