#include<cstdio>

int main()
{
    int n;
    char s[15][25];

    scanf("%d", &n);
    for (int i = 0; i < n; i++) {
        scanf("%s", s[i]);
    }
    for (int i = 0; i < n; i++) {
        printf("%s", s[i]);
    }

    printf("\n");
}