class Solution {

 public:

     bool isPalindrome(string s) {

         string str;

         for(int i=;i<s.size();i++){

             if( ('a'<=s[i]&&s[i]<='z')||(''<=s[i]&&s[i]<='') ){

                 str.push_back(s[i]);

             }else if('A'<=s[i]&&s[i]<='Z'){

                 str.push_back(tolower(s[i]));

             }

         }

         int m=,n=str.size()-;

         cout<<str;

         while(m<n){

             if(str[m]!=str[n]){

                 return false;

             }

             m=m+;n=n-;

         }

         return true;

     }

 };