    
    
int main(){
int n;
cin>>n;
int shuzu[100];

for(int i=0;i<n;i++){
cin>>shuzu[i];
}
for(int k=0;k<n;k++){
	if (shuzu[k]==0) {continue;}
	for(int j=k+1;j<n;j++){
		if (shuzu[j]==shuzu[k]) {shuzu[j]=0;}
		}
}
int t;
for(int q=0;q<n;q++){
	if (shuzu[q]!=0) cout<<shuzu[q];t=q;break;}

for(int w=t+1;w<n;w++){
 if (shuzu[w]==0) continue;
 cout<<","<<shuzu[w];
}

//for(i=0;i<n;i++){cout<<shuzu[i];}



return 0;

}