#include<stdio.h>
#include<string.h>
int main()
{
	char name[10][50];
	char lname[600];
	int i=0,j,k;
	int flag;
	printf("Enter 10 or less strings (max 50 characters each)\n");
	do
	{
		gets(name[i]);
		i++;
	}while((i!=10) && (strcmp(name[i-1],"-1")));

	strcpy(lname,"\0");
	for(j=0;j<i-1;j++)
	{
		flag = 0;
		for(k=0;k<j;k++)
		{
			if(!strcmp(name[k],name[j]))
			{
				flag = 1;
				break;
			}
		}
		if(!flag)
		{
			strcat(lname,name[j]);
			strcat(lname," ");
		}
	}

	printf("%s\n",lname);
}