// 1.1 Implement an algorithm to determine if a string has all unique characters. What if you cannot use additional data structure?

 #include <cstdio>

 #include <cstring>

 using namespace std;

 class Solution {

 public:

     bool isAllUnique(const char *s) {

         if (nullptr == s) {

             return false;

         }

         int i;

         int a[];

         memset(a, ,  * sizeof(int));

         for (i = ; s[i]; ++i) {

             if (a[s[i]]) {

                 return false;

             } else {

                 a[s[i]] = ;

             }

         }

         return true;

     };

 };

 int main()

 {

     Solution sol;

     char s[];

     while (scanf("%s", s) == ) {

         if (sol.isAllUnique(s)) {

             printf("Unique.\n");

         } else {

             printf("Not unique.\n");

         }

     }

     return ;

 }