#include <iostream>

#include <cstdlib>

#include <string>

using namespace std;

template<class T, class P>

T mul(T a, P b) {

    return a * b;

}

template<>

string mul<string, int>(string a, int b) {

    string res;

    for (int i=b; i>; i--) {

        res.append(a);

    }

    return res;

}

int main() {

    cout<<mul(,)<<endl;

    cout<<mul(string("haha"),)<<endl;

    return ;

}