Write a program that read text from user and remove all the character from the it except alphabets, space, comma and full stop. The resultant text is to be save to another string and then output the copied string. For this you need to use a procedure that takes offset of the input string as parameter and then performed the required task on it.

Sample Example: Her#e is gr8 0ppurnity!! To 8ec$ome 5ilen7 to 8etter 3ither or n0t @t. Her e is gr ppurnity to ec ome ilen to etter ither or n t t.