#include <iostream>
using namespace std;

int main() {
  cout << "Gamma rays are ionizing electromagnetic radiation, ";
  cout << "obtained by the decay of an atomic nucleus. Gamma ";
  cout << "rays are more penetrating, in matter, and can damage ";
  cout << "living cells to a great extent. Gamma rays are used ";
  cout << "in medicine (radiotherapy), industry (sterilization and disinfection)";
  cout << "and the nuclear industry." << endl;
  return 0;
}