My program passes the sample test given and also all the test cases given in discussion forum. But still I am getting WA#1. Can anybody tell me why?

Strange...I had taken input through getline and removed last character if it was null or end of line. And I was getting wrong answer. But when I changed it to the condition, that remove last character if it is not from 0 to 9, it got AC.
Can anybody explain why?