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Language/Type: C++ parameters string references

What is the output of the following code?

void mystery(string a, string& b) {
    a.erase(0, 1);
    b += a[0];
    b.insert(3, "FOO");

int main() { // 01234
    string a = "marty";
    string b = "stepp";
    mystery(a, b);
    cout << a << " " << b << endl;
    return 0;
(order shuffled)

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