int main(){
int a[100],b[100],n,i=0,j=0,t=0,p=0,r,x=0,z=0;
             scanf("%d",&n);  

	         for (i=0;i<n;i++){
		         scanf("%d",&a[i]);}
		printf("%d,",a[0]);
			 
		 
		
		for (i=1;i<n;i++){r=0;
				 t=a[i]; p=i;            
			for (x=0;x<p;x++){
				if(a[x]==t){
					r=1;
					break;}
			}

			if(r==0) {
					b[j]=t;
                      j=j+1;
		 }}

  for (z=0;z<j-1;z++){
				printf("%d,",b[z]);
  }
		printf("%d",b[j-1]);
	return 0;
}
