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Question #354 Difficulty: 1

According to the C++17 standard, what is the output of this program? 

    #include <cstdlib>
#include <iostream>

struct S {
    char s;
    S(char s): s{s} {}
    ~S() { std::cout << s; }
};

S a('a');

int main() {
    S b('b');
    std::exit(0);
}

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