This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#include <bits/extc++.h>
using namespace std;
using namespace __gnu_cxx;
const int MAXN = 1e6+5;
int head = 0;
rope<char> s[MAXN];
void Init() {}
void TypeLetter(char L) {
s[head+1] = s[head];
s[++head].push_back(L);
}
void UndoCommands(int U) {
s[head+1] = s[head - U];
++head;
}
char GetLetter(int P) {
return s[head][P];
}
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