1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
#include <iostream>
#include <string>

int main()
{
    int max_count;
    std::cin >> max_count;
    
    std::string result;
    for (int i=0; i!=max_count; i++)
    {
        std::string buffer;
        std::cin >> buffer;
        
        if (i!=0)
            result.insert(result.end(), '_');
        for (auto it=buffer.begin(); it!=buffer.end(); it++)
            result.insert(result.end(), *it);
    }
    
    std::cout << result;
    
    return 0;
}