Longest Palindrome by nn

System.in.eachLine{r=s=''
for(i=j=1;i<27;++j%2?s=/\${i++}$s/:(r+='(.)'))p=it=~r+s?:p
println p[0][0]}

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

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