#!/usr/bin/env python
# coding: utf-8

# In[1]:


def make_abba(a, b):
    return a+b+b+a
def main():
    
    print(make_abba('Hi', 'Bye'))
    
    print(make_abba('Yo', 'Alice'))
    
    print(make_abba('What', 'Up'))

if __name__ == '__main__':
    main() 


# In[ ]:




