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#include <iostream>
using namespace std;

class ReversibleString {
public:
    ReversibleString(const string &str) {
        s = str;
    }
    ReversibleString() {}
    void Reverse() {
        reverse(begin(s), end(s));
    }
    string ToString() {
        return s;
    }
private:
    string s;
};

int main() {
    return 0;
}