I did not know this is so simple

int main() { string S;

getline(cin, S);
 try {
    int integerValue = stoi(S); // Convert string to integer
    cout << integerValue << endl; // Print the integer value
} catch (const invalid_argument&) {
    cout << "Bad String" << endl; // Handle conversion error
} catch (const out_of_range&) {
    cout << "Bad String" << endl; // Handle range error
}

return 0;

}