Owl Get a Life

Compile Error

platonic3.cpp: In function ‘int main()’:
platonic3.cpp:13:14: error: no matching function for call to ‘std::__cxx11::basic_string<char>::copy()’
13 | b = a.copy();
| ^
In file included from /usr/include/c++/9/string:55,
from /usr/include/c++/9/bits/locale_classes.h:40,
from /usr/include/c++/9/bits/ios_base.h:41,
from /usr/include/c++/9/ios:42,
from /usr/include/c++/9/istream:38,
from /usr/include/c++/9/sstream:38,
from /usr/include/c++/9/complex:45,
from /usr/include/c++/9/ccomplex:39,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
from platonic3.cpp:1:
/usr/include/c++/9/bits/basic_string.h:2284:7: note: candidate: ‘std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::copy(_Char