function f(s,M,v)for l=1,#s do x=-s:sub(-l)v=v or M<x and#(""..x)>l and f(s:sub(1,-l-1),x)and l end return v or s==""end while""do print(f(io.read(),-1/0))end
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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