l=io.read()f=function(n,s,c)c=l:sub(n,n)n=n+1 t=c>''and{f(n,s)or c==l:sub(n,n)or f(n,s..c)}or print(s)end f(1,'')
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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