#include <iostream>

#include <cstdlib>
#include <ctime>
#include <string>

std::string randomstring(int len) {
    static long seed = time(0);
    seed += rand();
    srand(seed);
    std::string s;
    for(int i=0; i<len; ++i) {
        int r = rand() % 3;
        s.push_back(
            r == 0 ? rand()%(90-65) + 65
            : r == 1 ? rand()%(57-48) + 48
            : rand()%(122-97) + 97
        );
    }
    return s;
}


int main() {
    for(int i=0; i<20 ;i++)
        std::cout<<i<<" - "<<randomstring(10)<<std::endl;
    std::cin.get();
    return 0;
}