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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5.     ios::sync_with_stdio(false);
  6.     cin.tie(nullptr);
  7.  
  8.     string S;
  9.     if (!(cin >> S)) return 0;
  10.  
  11.     int freq[26] = {0};
  12.     for (char c : S) freq[c - 'a']++;
  13.  
  14.     for (int i = 0; i < 26; ++i) {
  15.         if (freq[i] == 1) {
  16.             cout << char('a' + i) << '\n';
  17.             return 0;
  18.         }
  19.     }
  20.  
  21.     return 0;
  22. }
Success #stdin #stdout 0s 5300KB
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https://ideone.com/XL19EO
language:
C++ (gcc 8.3)
created:
6 days ago
visibility:
public

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