Formatting problems

'' ' 
A = the eval (INPUT ()) 
S = "the Hello World" 
L = len (S) 
IF (A == 0): 
   Print (S) 
elif (A> 0): 
     for I in Range (0, L -1,2): 
         Print (S [I], S [I +. 1], On Sep = '') a space between characters # default 
     Print ( "D") 
the else: 
    for I in Range (0, L): 
        Print (S [I]) 
'' ' 
A = INPUT ()
 for I in A:
     Print (I, End = ' ' )
 123 
123 # default wrap 
123 
. 1 
2 
. 3