#!/usr/bin/env python3
# -*- coding: utf-8 -*-

ary = ['aa','bb','cc']

def Join(array, sep=' '):
    s = ''
    l = len(array)
    for i in range(l):
        s = s+str(array[i])
        if(i<l):
            s = s+sep
    return s 

print(Join(ary, '!'))