class NumberGenerator(object):
    def __init__(self):
        self.Number1 = 97
        self.Number2 = 96
        self._flag=False

    def getLetter(self):
        if self.Number1 >=122:
            self.Number1=97
            self._flag=True
        if self._flag==True:
            if(self.Number2==96):
                self.Number2+=1
                return chr(self.Number1) + chr(self.Number2)
            else:
                self.Number2+=1
                if(self.Number2>122):
                    self.Number1+=1
                    self.Number2=97
            return chr(self.Number1)+chr(self.Number2)
        self.Number1+=1
        return chr(self.Number1)

def main():
     r=NumberGenerator()
     for i in range(0,100000):
         print(r.getLetter(),end=' ')

if __name__ == "__main__": main()