#include <list> 
#include <iostream> 
 
using namespace std; 
 
int main() 
{ 
   list<char> coll {'a', 'b', 'c', 'd'};       
 
   for (auto  elem : coll)        
       elem += 4;     
 
   for (auto elem : coll) 
       cout << elem << ' '; 
 
   cout << endl; 
   return 0; 
}