Remove Characters Except Alphabets

C++ PROGRAM TO REMOVE CHARACTERS EXCEPT ALPHABETS  IN A STRING

Sample Test Case    :    Enter the String : 3He*ll#o!

Sample Output    :  Hello 

CODE

#include<bits/stdc++.h>

using namespace std;

int main()

{

    string line;

    cout<<"Enter a String : ";

    getline(cin,line);

    for(int i=0;i<line.size();++i)

    {

        if(!((line[i]>='a'&& line[i]<='z')||(line[i]>='A'&&line[i]<='Z')))

        {

            line[i]='\0';

        }

    }

    cout<<"Output String :"<<line;

    return 0;

}