int main() {
int size;
cin>>size;
int counter = 0 ;
int array[size];
for(int f = 0 ; f<size ; ++f) {
cin >> array[f] ;
}
bool marker = false ;
for (int f = 0 ; f < size ; ++f) {
for (int s = size ; s == 0 ; --s) {
if (array[f] == array[s]) {
marker = true ;
}
if (marker) {
++counter ;
}
}
}
if (counter==size) {
cout << "Symmetrical" << endl ;
} else {
cout << "Not Symmetrical" << endl ;
}
}