#include <string>
#include <iostream>
#include <vector>

using namespace std;

class Combinator {
public:
    virtual string show();
};

class Var : Combinator {
public:
    Var(string name) : name(name) {}
    string name;
    string show() {
        return name;
    }
};

class App : Combinator {
public:
    App(Combinator *m, Combinator *n) : m(m), n(n) {}
    Combinator *m, *n;
    string show() {
        return "(" + m->show() + n->show() + ")";
    }
};

class Lam : Combinator {
public:
    Lam(Var *a, Combinator *n) : a(a), n(n) {}
    Var *a;
    Combinator *n;
};

string redex(Combinator *x) {
    if (typename(x))
}

int main() {
    string s;
    cin >> s;
    cout << redex(s) << "\n";
}