use Python

Input a string, reverse the string and insert commas between each character to output, for example

Input:

The first line at the beginning represents the number of test data. Next, input "Orange", first reverse to "egnarO", insert commas "e,g,n,a,r,O" in the middle.

Note 1: For the read-in string, the last character is ' ' (please judge the last character so that it is not in the loop) Note 2: The output string should not have a comma at the end (please judge the last character and don't add a comma)

input	output
2	e,g,n,a,r,O
Orange	.,k,o,o,b, ,a, ,s,i, ,s,i,h,T
This is a book.