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a guest Jun 25th, 2019 63 Never
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  1. #include <iostream>
  2. #pragma warning(disable : 4996)
  3. #include <string>
  4. using namespace std;
  5.  
  6.  
  7. int main()
  8. {
  9.  
  10.     freopen("input.txt", "r", stdin);
  11.     freopen("output.txt", "w", stdout);
  12.  
  13.  
  14.  
  15.     string str;
  16.  
  17.     string sentence = "";
  18.  
  19.     while (getline(cin, str)) {
  20.         string temp;
  21.         for (auto ch1 : str) {
  22.             if ((ch1 >= 65) && (ch1 <= 90)) { //big chars
  23.                 ch1 += 32;
  24.                 temp += ch1;
  25.             }
  26.             else if ((ch1 >= 97) && (ch1 <= 122)) { //small chars
  27.                 temp += ch1;
  28.             }
  29.             else if ((ch1 >= 48) && (ch1 <= 57)) { //numbers
  30.                 temp += ch1;
  31.             }
  32.             else if (ch1 == 32) {
  33.                 if (!temp.empty()) {
  34.  
  35.                     if (temp.size() > 3) {
  36.                         sentence += temp + " ";
  37.                     }
  38.                     temp = "";
  39.                 }
  40.  
  41.             }
  42.             else if (ch1 == 10 || ch1 == 13) {
  43.                 sentence += ch1;
  44.             }
  45.         }
  46.  
  47.     }
  48.  
  49.     cout << sentence ;
  50.  
  51.  
  52.  
  53.     return 0;
  54.  
  55. }
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