#include <vector>
using namespace std;
vector<char> v;
void Init() {
  v.clear();
}
void TypeLetter(char L) {
  v.push_back(L);
}
void UndoCommands(int U) {
  for(int i=0;i<U;i++){
    v.pop_back();
  }
}
char GetLetter(int P) {
  return v[P];
}
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