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Compile Error

guanine.cpp: In function ‘int main()’:
guanine.cpp:32:21: error: no match for ‘operator==’ (operand types are ‘std::string’ {aka ‘std::__cxx11::basic_string<char>’} and ‘int’)
32 | if (command == 'ADD_BACK')
| ~~~~~~~ ^~ ~~~~~~~~~~
| | |
| | int
| std::string {aka std::__cxx11::basic_string<char>}
In file included from /usr/include/c++/9/regex:62,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:110,
from guanine.cpp:1:
/usr/include/c++/9/bits/regex.h:1026:5: note: candidate: ‘template<class _BiIter> bool std::__cxx11::operator==(const std::__cxx11::sub_match<_BiIter>&, const std::__cxx11::sub_match<_BiIter>&)’
1026 | operator==(const sub_match<_BiIter>& __lhs, const sub_match<_BiIter>& __rhs)
| ^~~~~~~~
/usr/include/c++/9/bits/regex.h:1026:5: note: t