#include <iostream>
#include <map>
#include <string>
using namespace std;
int main()
{ map <string, int> s = {{"1а",20},{"1б",21},{"2а",15},{"2б",33},{"3а",23},{"3б",31},{"4а",25},{"4б",32}};
  map <string, int> :: iterator i;
  for (i= s.begin(); i != s.end(); i++)
  cout<<"{"<<i->first<< ","<< i->second<<"} ";
  cout<<endl;
  s["1а"]+=1;
  s["1б"]-=1;
  s["2а"]+=2;
  s["2б"]-=2;
  s["3а"]+=3;
  s["3б"]-=3;
  s["4а"]+=4;
  s["4б"]-=4;
  for (i= s.begin(); i != s.end(); i++)
  cout<<"{"<<i->first<< ","<< i->second<<"} ";
  cout<<endl;
  return 0;
}