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

int main()
{
    string creditcard, wait;
    cout << "Welcome to the BIN  Validator!\n";
    cout << "Enter your credit card to verify your bank:";
    cin >> creditcard;


    cout << "The length of credit card is: " ;
    cout << creditcard.length();

    if (creditcard.substr(0,2) == "34"){
    cout << "\nYou are using American Express.\n";

		}

    cout << "\nenter any key to quit:  ";
		cin >> wait;
		return 0;
		}