Accepted
foo.cc: In function 'int main()':
foo.cc:17:21: warning: iteration 26 invokes undefined behavior [-Waggressive-loop-optimizations]
   17 |                 c[i]=getchar();
      |                 ~~~~^~~~~~~~~~
foo.cc:15:22: note: within this loop
   15 |         for(int i=1;i<=27;i++)
      |                     ~^~~~
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