Hello, I have this problem and I can't stop it looping only 'A'...it won't print 'A' through 'Z'?...

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



int main()
{
    cout << "here is a list" << endl;
    char letter = 'A';

    while (letter <= 'Z')
    {
        cout << letter << '\t' << static_cast<int>(letter) << endl;
    }

    return 0;

}