foo.cc: In function 'int main()':
foo.cc:20:18: warning: iteration 25 invokes undefined behavior [-Waggressive-loop-optimizations]
   20 |         if(word[i]!=0)
      |            ~~~~~~^
foo.cc:17:23: note: within this loop
   17 |     for (int i = 1; i <= 26;i++)
      |                     ~~^~~~~

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