#include <algorithm>
#include <cstring>
#include <iostream>
#include <string>

using namespace std;

int main() {
    const auto bar = 13U;
    const char multiplicand[] = "0, ";
    const auto length = strlen(multiplicand);
    string foo(bar * length, '\0');
    
    generate_n(foo.begin(), bar * length, [&](){
        static auto i = 0U;
        return multiplicand[i++ % length];
    });
    
    cout << foo;
}