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  1. #include <cctype>
  2. #include <iostream>
  3. #include <string>
  4. #include <algorithm>
  5. using namespace std;
  6.  
  7. int main()
  8. {
  9. string s;
  10. cout << "Enter message: ";
  11. getline(cin, s);
  12.  
  13. transform(s.begin(), s.end(), s.begin(), [](char c) {return tolower(c);});
  14. s.erase(remove_if(s.begin(), s.end(), [](char c) {return !isalpha(c);}), s.end());
  15. sort(s.begin(), s.end());
  16.  
  17. cout << s << endl;
  18. }
  19.  
Success #stdin #stdout 0s 3476KB
stdin
Wow! Whenever you go outside, it is actually a very pretty world.
stdout
Enter message: aaacddeeeeeeghiiilllnoooooprrrrsstttttuuuvvwwwwyyyy