X by potato

n=input()
a=list(' '*n)
for i in range(n):
\x09a[-i]=a[i-1]=' '
\x09a[~i]=a[i]='X'
\x09b=''.join(a)
\x09print b[:b.rfind('X')+1]

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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return top