#include <iostream>
#include <cstring>
#include <cctype>

class Counter
{
    char* m_pStr;
    unsigned int m_nOwners;
    Counter* pNext;

    static Counter* Head;
    static unsigned int m_curCounters;
    Counter(char* str);
public:
    static Counter* Init(char* str);
    static void Count();
    const char* Get_Str();
    static void Change_Register();
    static void AlphabetSort();
    static void Print_All();
    void Swap_Str(Counter& ref);
    void Del();
    void Add() { m_nOwners++; }
    ~Counter();
};

void Counter::Change_Register()
{
    int n = m_curCounters;

    Counter* p = Head;

    while (n--)
    {
        int i = 0;

        while (i < strlen(p->m_pStr))
        {
            if (('A' <= p->m_pStr[i]) && (p->m_pStr[i] <= 'Z'))
                tolower(p->m_pStr[i]);
            if (('a' <= p->m_pStr[i]) && (p->m_pStr[i] <= 'z'))
                toupper(p->m_pStr[i]);
            i++;
        }
        if (n != 0) p = p->pNext;
    }

}