int main()
{
    int n,i,j,o,p,q,B[300],C[10],A[300],k;
     
    scanf("%d\n",&n);
    for(i=0;i<n;i++) {scanf(" %d",&A[i]);}
    B[0]=A[0];
    for(i=1;i<n;i++){
		for(j=0,k=1;j<i;j++){
		if(B[j]==A[i]) k=0;

		}
     if(k!=0) B[i]=A[i]; 
	 else B[i]='\0';  //once repeated,rid it
    }
    for(q=0,p=0;p<n;p++){
    	if(B[p]!='\0') {C[q]=B[p];q++;}
    }
    for(i=-1,o=0;o<q;o++,i++){
    	if(i>=0) printf(",");
    	printf("%d",C[o]);
    }
    
	return 0;
}
