foo.cc: In function 'int main()':
foo.cc:10:54: warning: array subscript has type 'char' [-Wchar-subscripts]
   10 |                         if('A' <= i && i <= 'Z') fnt[i] ++;
      |                                                      ^
foo.cc:11:54: warning: array subscript has type 'char' [-Wchar-subscripts]
   11 |                         if('a' <= i && i <= 'z') fnt[i] ++;
      |                                                      ^
foo.cc:12:66: warning: array subscript has type 'char' [-Wchar-subscripts]
   12 |                         if(i == '.' || i == '?' || i == '!') snt[i] ++;
      |                                                                  ^

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