/in/cipher.cpp: In function 'void Encryption(std::__cxx11::string, int)':
/in/cipher.cpp:51:7: error: unused variable 'isupper' [-Werror=unused-variable]
   int isupper, row, col;
       ^~~~~~~
/in/cipher.cpp:51:16: error: unused variable 'row' [-Werror=unused-variable]
   int isupper, row, col;
                ^~~
/in/cipher.cpp:51:21: error: unused variable 'col' [-Werror=unused-variable]
   int isupper, row, col;
                     ^~~
cc1plus: all warnings being treated as errors
/in/compile/Makefile:23: recipe for target 'cipher.o' failed
make: *** [cipher.o] Error 1