f=(r=readline)(i=36) for(s=r(o='');--i;)s+='\n'+r() for(s=s.split(o);c=f>'e'?s[i]||s[4021-i]:s.reverse().pop();i+=2)o+=c print(o)
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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