#include <iostream>
#include <cstring>
#define uint32 unsigned int

using namespace std;

static char map[] = "abcdefghjklmnopqrstuvwxyzABCDEFGHJKLMNOPQRSTUVWXYZ1234567890";
static uint32 lenMap = strlen(map);
static char current[] = "00";

int find(const char* str, const char* fnd)
{

    for (uint32 x = 0; x < strlen(str); x++)
    {
        char chr = (char)str[x];
        if (strncmp(&chr, fnd, 1 ) == 0)
            return x;
    }
    return -1;
}

void incWord(char* word)
{
    static uint32 wordLen = strlen(word)-1;
    for(uint32 i = wordLen;i>=0;i--)
    {
        int pos = find(map,&word[i])+1;
        if (pos == lenMap)
        {
            word[i] = map[0];
         //   cout << word << " " << pos << lenMap << endl;
            if (i==0)
            {
                char newChar = (char)map[0];
                strcat(word,&newChar);
            }
        }
        else
        {
                word[i] = map[pos];
                return;
        }
    }
}



int main()
{
    while(true){
        incWord(current);
        cout <<"!"<< current<<"!"<<endl;
       }
    return 0;
}