1 #include <iostream>
2 #include <algorithm>
3 #include <vector>
4
5 using namespace std;
6
7 int main()
8 {
9 int n;
10 while(cin >> n)
11 {
12 if(n==1)
13 {
14 cout << "Yes" << endl;
15 continue;
16 }
17 vector<int> v(26,0);
18 while(n --)
19 {
20 char tmp_color;
21 cin >> tmp_color;
22 v[tmp_color-'a'] ++;
23 }
24 int multi_color_num = 0;
25 int single_color_num = 0;
26 for(int i = 0;i < 26;i ++)
27 {
28 if(v[i]==1)
29 single_color_num ++;
30 else if(v[i]>=2)
31 multi_color_num ++;
32 }
33 if(multi_color_num)
34 cout << "Yes" << endl;
35 else
36 cout << "No" << endl;
37 }
38 return 0;
39 }
