foo.cc: In lambda function:
foo.cc:15:25: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   15 |             if (l > 'Z' && l < 'a' || l > 'z')  l -= 26;
      |                 ~~~~~~~~^~~~~~~~~~
foo.cc: In function 'int main()':
foo.cc:21:27: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   21 |         if (letter >= 'A' && letter <= 'Z' || letter >= 'a' && letter <= 'z')
      |             ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~

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