#include <iostream>
#include <cstdlib>

using namespace std;
char* Litery(char);
char x;
int main()
{

cout << "Podaj litere: ";
cin >> x;

cout << Litery(x);
int liczba_liter =(int)x - 'A' + 1;
char* liter = Litery(x);

for(int i = 0; i < liczba_liter; ++i) {
liter[i];
}

return 0;
}

char* Litery(char c) {
int liczba_liter = c - 'A' + 1;
char* litery= new char[liczba_liter];
for(int i = 0; i < liczba_liter; ++i) {
litery[i] = 'A'+i;
}

return litery;
}