s=str(raw_input('Enter something'))
set1=s.split()
list1=[]
rev=[]
s4=''
for s1 in set1:
    list1.append(s1)     
while list1:
    s3=list1.pop()    
    s4+=s3
    s4+=' '
  
print s4   

Enter somethingTraceback (most recent call last):
  Line 1, in <module>
    s=str(raw_input('Enter something'))
EOFError