Write the output of the following Python program code:
Data = ['D', 'O' ',' ',' I' , 't' , ' @' , ' 1' , '2 ' , ' 3' , ' ', ' !']
The output is:
['d', 'o', 'I', 'i', 't', '@', '@', '1', '1', '2', '3', '!', '!']