c++ Making a random number/letter generator, something wrong in the code : im trying to make a wordlist generator that generates random letters and numbers, however Im having an error where it only gets the first word in the list right, the rest only displays 2 letters/numbers, there is no error in the compiler, at this point it feels like i´ve tried everything without any luck. Here is the code:

        #include <iostream>
    #include <sstream>
    #include <string>
    #include <fstream>
    #include <windows.h>
    #include <ctime>
    using namespace std;
    
    static const char alphanum[] =
    "0123456789"
    "ABCDEFGHIJKLMNOPQRSTUVWXYZ";  // chars we need for generation
    
    int stringLength = sizeof(alphanum) - 1;
    
    char genRandom(){
        return alphanum[rand() % stringLength];
    }
    
    int main(){
    
    
    // WORD LISTS LENGTH
    int WordListTotalLength;
    int WordListThisLength = 0;
    cout << " How many words should be added?" << endl;
    cin >> WordListTotalLength;
    
    // WORD LISTS LENGTH ENDS HERE
    
        SetConsoleTitle("LetterNumberGenerator");
    
        srand(time(0));
        std::string Str;
    
        int length = 0;
    
        cout << "Enter the length of each word:" << endl;
        cin >> length;
        length = length - 1;
    
    
        for(unsigned int i = 0; i < length; ++i){
        Str += genRandom();
        }
        ofstream myfile;
      myfile.open("OutputWordlist.txt");
    
      while (WordListThisLength < WordListTotalLength) {
    
      myfile <<Str + genRandom();
      myfile << "\n" ;
      genRandom();
         Str = genRandom();
      WordListThisLength = WordListThisLength +1;
      }
      myfile.close();
        cout << "Generation is finished." << endl;
    
    
    
    cout << endl;
    system("PAUSE");
    return 0;
    }



But all I get from the "OutputWordlist.txt" is the following:

if inputing that i want 5 words in total, with 10 letters or numbers on each line i end up with this:

    N5VKP15QAW
    EN
    YK
    48
    OK


And sorry if my post is a bit blurry, this is my first time posting. Any help or suggestions would be very appreciated!