#include <stdio.h>

int main()
{
	int N;
	scanf("%d", &N);

	int count = 0;
	char S[201];

	for (int i = 0; i < N; i++)
	{
		int len;
		char str[21];
		scanf("%s%n", &str, &len);
		
		for (int i = 0; i < len - 1; i++)
		{
			S[count] = str[i];
			count++;
		}
	}

	printf("%.*s", count, S);

	return 0;
}