uppercase the 17th letter by flimflam

for t in io.stdin:lines()do print(t:gsub("^("..("%A*%a"):rep(16).."%A*)(%a)",function(a,b)return a..b:upper()end)or 0)end

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

To protect the system from spam, please input your favorite sport (hint: I believe its name must start with 'g', case insensitive)

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