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  1. #include <iostream>
  2.  
  3. int main() {
  4.     std::string i;
  5.  
  6.     std::cin >> i;
  7.     int l = i.length();
  8.  
  9.     while (l < 4) {
  10.         std::cin >> i;
  11.     }
  12.  
  13.     std::string f = i.substr(3, 1);
  14.     i.insert(3, f);
  15.  
  16.     std::cout << i;
  17.     return 0;
  18. }
Success #stdin #stdout 0s 3476KB
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https://ideone.com/7topbn
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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