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Mail Order type application

Databend (29)
I'm trying to do an application that allows the user to enter a 4-5 character string consisting of a number, two letters that determine the output, and then 1 or 2 more numbers. If it is not 4-5 characters it should display a error message and display an error message if the 2 and 3rd characters are not a correct delivery method. I think I have a solid base to it but I have various errors and parts I don't know how to do. I would really appreciate it if I could get some help.

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  // Chapter 13 Ex. 26.cpp : Defines the entry point for the console application.
//

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


int main()
{
	string mailcd = "";
	string deliverMethod = "";
	cout << "Enter a mail code(-1 to end): ";
	getline(cin, mailcd);

	while (mailcd != "-1")
	{
		if (mailcd.length == 5 || mailcd.length == 4)
		{
			if (mailcd[1] = "M" && mailcd[2] = "S")
			{
				deliverMethod = "Mail - Standard";
			}
			else if (mailcd[1] = "M" && mailcd[2] = "P")
			{
				deliverMethod = "Mail - Priority";
			}
			else if (mailcd[1] = "F" && mailcd[2] = "S")
			{
				deliverMethod = "FedEx - Standard";
			}
			else if (mailcd[1] = "F" && mailcd[2] = "O")
			{
				deliverMethod = "Fedex - Overnight";
			}
			else if (mailcd[1] = "U" && mailcd[2] = "P")
			{
				deliverMethod = "UPS";
			}
			else
			{
				"Enter a valid delivery method.";
			}
			cout << "Delivery method: " << deliverMethod << endl;
		}
	}
    return 0;
}
Repeater (3046)
while (mailcd != "-1")

Where, in your while loop, can mailcd change? Why would this loop not loop forever?
Databend (29)
I'm not sure, I've been trying to figure this program out for the past hour or so and i'm at a loss.
Repeater (3046)
If you want a while loop to end, you need to change something inside the while loop to make the condition false.

https://www.tutorialspoint.com/cplusplus/cpp_while_loop.htm
Databend (29)
The loop isn't my main problem the (mailcd[1] = "F" && mailcd[2] = "O") is getting errors and so is the rest of the else statements underneath the = "_".
Repeater (3046)
= is not the same as ==
Databend (29)
So I should be using ==?
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