define a palindromic string to be a string which when all the nonalphanumeric are removed it reads the same front to back ignoring case. For example, “A man, a plan, a canal, Panama.” and “Able was I, ere I saw Elba!” are palindromic, but “Ray a Ray” is not.
Each line of the input contains a string. Input file is terminated by end of file.
For each line of input you will have to produce one line of output. "true" if the input is a palindromic string; "false" otherwise.