#include <string>
#include <iostream>
#include <conio.h>      //_getch();
#include <Windows.h>
#include <ctime>        //time_t, struct tm, localtime_s, strftime
using namespace std;

char* tag(){
    //char *random1 = new char[];
    //random1 = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    //  size_t size1 = (sizeof random1 / sizeof random1[0]);

    //char *random2 = new char[];
    //random2 = "0123456789";
    //  size_t size2 = (sizeof random2 / sizeof random2[0]);

    char random1[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    char random2[] = "0123456789";
    size_t size1 = (sizeof random1 / sizeof random1[0]-1);
    size_t size2 = (sizeof random2 / sizeof random2[0]-1);

        int r1 = 0;
        int r2 = 0;

    char ra1[5] = "";
    char ra2[4] = "";
    char s[9] = "";

    for(int i = 0; i<4; ++i){
        r1 = rand() % size1;
        ra1[i] = random1[r1];
    }

    for (int i = 0; i < 4; ++i){
        r2 = rand() % size2;
        ra2[i] = random2[r2];
    }

    sprintf_s(s,"%c%c%c%c-%c%c%c",ra1[0],ra1[1],ra1[2],ra1[3],ra2[0],ra2[1],ra2[2]);
    cout << s << endl;
    _getch();

    //delete [] random1;
    //delete [] random2;

    return s;
}

const time_t ctt = time(0);

int main(){
    cout << tag();
    _getch();
return 0;