String removal 2 small diff[again]

#include <iostream>
#include <string>
#include <cstdlib>

using namespace std;
string newString;
string inputString;
string removeString(string inputString)
{
    for(int i =0; i<inputString.length();i++)
    {
        if(inputString.at(i)!= '7') {
          newString+=inputString.at(i);
        }
    }
    return newString;
}

int main() {
    cout << "Enter the input string: "<< endl;
 //   cin >> inputString >> endl;
    getline(cin, inputString);
    cout << "The new string is: " << removeString(inputString)<< endl;

}