#include <string>
const int MxN = 1000010;
char s[MxN];
int len;
void Init() {
len = 0;
}
void TypeLetter(char L) {
s[len++] = L;
}
void UndoCommands(int U) {
len -= U;
}
char GetLetter(int P) {
return s[P];
}
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