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  1. #include <iostream>
  2.  
  3. using namespace std;
  4.  
  5. int main()
  6. {
  7.     start:
  8.     string s;
  9.     char t;
  10.     cin >> s;
  11.  
  12.     if(s.size() > 3){
  13.         cout << "Invalid" << endl;
  14.         goto start;
  15.     }
  16.  
  17.  
  18.     t = s[2];
  19.     s[2] = s[0];
  20.     s[0] = s[1];
  21.     s[1] = t;
  22.  
  23.     cout << s;
  24.  
  25.  
  26.     return 0;
  27. }
  28.  
Success #stdin #stdout 0.01s 5288KB
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Standard input is empty
stdout
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Standard output is empty
https://ideone.com/itIpjr
language:
C++ (gcc 8.3)
created:
1 day ago
visibility:
public

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