#include <iostream>
#define SIZE 100000
using namespace std;
int main()
{
char a[SIZE];
int n, i;
cin >> n;
for (i = 0; i < n; i++)
cin >> a[i];
for (i = 0; i < n - 1; i++)
if (a[i] > a[i + 1])
break;
if (i == n - 1)
cout << "Sorted";
else
cout << "Not Sorted";
return 0;
}
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