#include <iostream>
#include <cstring>
using namespace std;

class String {
private:
    char* str;
    int len;
public:
    String(int len = 0) {
        this->len = len;
        str = new char[len];
    }
    String(const String& other) {
        len = other.len;
        str = new char[other.len];
        for (int i = 0; i < len; i++) {
            str[i] = other.str[i];
        }
    }
    String(const char* str) {
        int counter = 0;
        while (str[counter] != 0) counter++;
        len = counter;
        this->str = new char[len];
        for (int i = 0; i < len; i++) {
            this->str[i] = str[i];
        }
    }
    char& operator[](int index) {
        return str[index];
    }
    char operator[](int index) const {
        return str[index];
    }
    ~String() {
        delete[] str;
    }
    String& operator=(String& other) {
        delete[] str;
        len = other.len;
        str = new char[other.len];
        for (int i = 0; i < len; i++) {
            str[i] = other.str[i];
        }
        return *this;
    }
    String& operator+(String& other) {
        char* str_new = new char[len];
        for (int i = 0; i < len; i++)
        {
            str_new[i] = str[i];
        }
        str = new char[len + other.len];
        for (int i = 0; i < len; i++) {
            str[i] = str_new[i];
        }
        for (int i = 0; i < other.len; i++) {
            str[i+len] = other[i];
        }
        len += other.size();
        for (int i = 0; i < len + other.len; i++)
        {
            if (i % 2 != 0)
            {
                str[i] = '_';
            }
        }
        return *this;
    }
    int size() const {
        return len;
    }
    friend istream& operator>>(istream& in, String& a);
    friend ostream& operator<<(ostream& on, String& a);
};
istream& operator>>(istream& in, String& a) {
    int buffer_size = 1000000;
    char* buffer = new char[buffer_size];
    in.getline(buffer, buffer_size);
    a.str = buffer;
    a.len = strlen(buffer);
    return in;
}

ostream& operator<<(ostream& on, String& a) {
    for (int i = 0; i < a.size(); i++) {
        on << a[i];
    }
    on << endl;
    return on;
}

int main() {
    String q,w,e,r,t,y;
    int tmp;
    cin >> q >> w >> e >> r >> t;
    y = q + w + e + r + t;
    cout << y;
    return 0;
}