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Aug 7th, 2021
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  1. #include <bits/stdc++.h>
  2.  
  3. using namespace std;
  4.  
  5. int main(){
  6. int n;
  7. cin >> n;
  8. string s;
  9. cin >> s;
  10. string dummy="";
  11. dummy+=s;
  12. for(int i=0;i<s.size();i++)
  13. {
  14. if(s[i]=='a')
  15. {
  16. s.erase(s.begin()+i);
  17. }
  18. }
  19. string a="";
  20. string b="";
  21. for(int i=0;i<s.size()/2;i++)
  22. {
  23. a+=s[i];
  24. }
  25. for(int i=s.size()/2;i<s.size();i++)
  26. {
  27. b+=s[i];
  28. }
  29. if(a==b)
  30. {
  31. size_t t=dummy.find(a);
  32. int x=a.size();
  33. if(t!=string::npos)
  34. {
  35. for(int i=t;i<=dummy.size();i++)
  36. {
  37. if(x>0)
  38. {
  39. dummy.erase(dummy.begin()+i);
  40. x--;
  41. }
  42. }
  43. }
  44. cout << dummy;
  45. }
  46. else
  47. {
  48. cout << ":(";
  49. }
  50.  
  51. return 0;
  52. }
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