while 1:n=input();j=0;exec 4*n*'u=" _"[j%n==n-1 and j/n<3]*n;print(" |"[j/n==1]+u+"|"+u+" |"[j/n==2]).rstrip();j+=1;'
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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