#include <iostream>
 
 
int main() {
   int previous;
   std::cin >> previous;
 
   std::size_t count = 1;
 
   for (int current; std::cin >> current; ) {
      if (current == previous) {
         ++count;
      } else {
      	 std::cout << previous << ' ';
 
         previous = current;
 
         if (count != 1) {
            std::cout << count << ' ';
            count = 1;
         }
      }
   }
 
   std::cout << previous;
 
   if (count != 1) {
   	   std::cout << ' ' << count;
   }
 
   std::cout << std::endl;
}

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

MSAxIDEgMiAxIDEgMQ==

1 1 1 2 1 1 1