Print the part of a string after and before a part or sequence

#include <iostream>
#include <string>
using namespace std;

bool start_with(string start, string s)
{
    if (start.find(s) == 0)
    {
        return true;
    }
    return false;
}

int main()
{
    string input;
    cout << "Enter a String with (\" and \"): ";
    cin >> input;
    string startT = "(\"";
    string endT = "\")";
    int startLen = startT.length(); // 2
    int endLen = endT.length();     // 2
    int strLen = input.length();    // if hello => 2+5+2 = 9
    cout << strLen << endl;
    string output = ""; // output = 9 - 2 - 2 => strLen - endLen - startLen
    output = input.substr(startLen, (strLen - endLen - startLen));
    cout << output << endl;
}