#include <iostream>
using namespace std;
void DoThat(char x[], char y[], int N,char z[])
{
    int i, j;
    int words = 1;
    for (i = 0; x[i] != '\0'; i++)
    {
        if (x[i] == ' ')
        {
            words++;
        }
        if (words == N)
        {
            i++;
            break;
        }
    }
    for (j = 0;; j+=2)
    {
        if (x[i] == ' ')
        {
            break;
        }
        z[j] = x[i];
        i++;
    }
    z[j] = '\0';
    //
    words = 1;
    for (i = 0; y[i] != '\0'; i++)
    {
        if (y[i] == ' ')
        {
            words++;
        }
        if (words == N)
        {
            i++;
            break;
        }
    }
    for (j = 1;; j += 2)
    {
        if (y[i] == ' ')
        {
            break;
        }
        z[j] = y[i];
        i++;
    }
    z[j] = '\0';
    //
}
void main()
{
    char x[100], y[100], z[100];
    int n = 3;
    gets_s(x);
    gets_s(y);
    DoThat(x, y, n, z);
    cout << z;
    system("pause");
}