foo.cc: In function 'long long int check()':
foo.cc:9:59: warning: unused variable 'temp3' [-Wunused-variable]
    9 |         int temp1 = s[0][0] - 'A', temp2 = s[1][0] - 'A', temp3 = s[2][0] - 'A';
      |                                                           ^~~~~

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