#include <iostream>
using namespace std;

int main() {
  int i[12] = { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 };

  for (auto v : i)
    std::cout << v << std::endl;

  for (auto& v : i)  // Add "&" here.
    v = v + 1;

  for (auto v : i)
    std::cout << v << std::endl;

  return 0;
}