#include <algorithm>
#include <array>
#include <string>
#include <iostream>
#include <initializer_list>
 
template<class Type, class Next>
bool is_one_of(const Type& needle, const Next& next)
{return needle==next;}
template<class Type, class Next, class ... Rest>
bool is_one_of(const Type& needle, const Next& next, Rest... haystack)
{return needle==next || is_one_of(needle, haystack...);}
 
int main() {
    std::string X, Y;
    if (is_one_of(X, Y, "HI"))
        std::cout << "it is!";
    else
        std::cout << "it isn't!";
    return 0;
}

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