int ReverseStrings(char buffer[])
{
	int check = -1;
	int i = 0;

	while (buffer[i] != '\0' && check)
	{
		if (!((buffer[i] >= 'a' && buffer[i] <= 'z') || (buffer[i] >= 'A' && buffer[i] <= 'Z') || (buffer[i] == ',')))
			check = 0;
		i++;
	}

	if (check)
	{
		int length = i + 1;
		int j = i; // length of array
		int temp;
		i = 0;
		while (buffer[i] < length / 2 && j > length / 2)
		{
			temp = buffer[i];
			buffer[i] = buffer[j];
			buffer[j] = temp;
			j--;
			i++;
		}
		check = -1;
		printf("%s", buffer);
	}

	return check;
}