Language: C++

#include<string>
#include<algorithm>
#include<iostream>
#include<cstdio>
using namespace std;
int main()
{
	int a,b;
	cin >> a>>b;
string ss="";
  ss >> a+b;
cout<<ss.str().size()<<endl;
return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:6: error: no match for 'operator>>' (operand types are 'std::string' {aka 'std::__cxx11::basic_string<char>'} and 'int')
   11 |   ss >> a+b;
      |   ~~ ^~ ~~~
      |   |      |
      |   |      int
      |   std::string {aka std::__cxx11::basic_string<char>}
In file included from /usr/include/c++/14/string:55,
                 from a.cc:1:
/usr/include/c++/14/bits/basic_string.tcc:835:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::basic_istream<_CharT, _Traits>& std::operator>>(basic_istream<_CharT, _Traits>&, __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
  835 |     operator>>(basic_istream<_CharT, _Traits>& __in,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.tcc:835:5: note:   template argument deduction/substitution failed:
a.cc:11:11: note:   'std::string' {aka 'std::__cxx11::basic_string<char>'} is not derived from 'std::basic_istream<_CharT, _Traits>'
   11 |   ss >> a+b;
      |           ^
In file included from /usr/include/c++/14/bits/memory_resource.h:38,
                 from /usr/include/c++/14/string:68:
/usr/include/c++/14/cstddef:131:5: note: candidate: 'template<class _IntegerType> constexpr std::__byte_op_t<_IntegerType> std::operator>>(byte, _IntegerType)'
  131 |     operator>>(byte __b, _IntegerType __shift) noexcept
      |     ^~~~~~~~
/usr/include/c++/14/cstddef:131:5: note:   template argument deduction/substitution failed:
a.cc:11:3: note:   cannot convert 'ss' (type 'std::string' {aka 'std::__cxx11::basic_string<char>'}) to type 'std::byte'
   11 |   ss >> a+b;
      |   ^~
In file included from /usr/include/c++/14/istream:1109,
                 from /usr/include/c++/14/iostream:42,
                 from a.cc:3:
/usr/include/c++/14/bits/istream.tcc:978:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(basic_istream<_CharT, _Traits>&, _CharT&)'
  978 |     operator>>(basic_istream<_CharT, _Traits>& __in, _CharT& __c)
      |     ^~~~~~~~
/usr/include/c++/14/bits/istream.tcc:978:5: note:   template argument deduction/substitution failed:
a.cc:11:11: note:   'std::string' {aka 'std::__cxx11::basic_string<char>'} is not derived from 'std::basic_istream<_CharT, _Traits>'
   11 |   ss >> a+b;
      |           ^
/usr/include/c++/14/istream:849:5: note: candidate: 'template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(basic_istream<char, _Traits>&, unsigned char&)'
  849 |     operator>>(basic_istream<char, _Traits>& __in, unsigned char& __c)
      |     ^~~~~~~~
/usr/include/c++/14/istream:849:5: note:   template argument deduction/substitution failed:
a.cc:11:11: note:   'std::string' {aka 'std::__cxx11::basic_string<char>'} is not derived from 'std::basic_istream<char, _Traits>'
   11 |   ss >> a+b;
      |           ^
/usr/include/c++/14/istream:854:5: note: candidate: 'template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(basic_istream<char, _Traits>&, signed char&)'
  854 |     operator>>(basic_istream<char, _Traits>& __in, signed char& __c)
      |     ^~~~~~~~
/usr/include/c++/14/istream:854:5: note:   template argument deduction/substitution failed:
a.cc:11:11: note:   'std::string' {aka 'std::__cxx11::basic_string<char>'} is not derived from 'std::basic_istream<char, _Traits>'
   11 |   ss >> a+b;
      |           ^
/usr/include/c++/14/istream:896:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(basic_istream<_CharT, _Traits>&, _CharT*)'
  896 |     operator>>(basic_istream<_CharT, _Traits>& __in, _CharT* __s)
      |     ^~~~~~~~
/usr/include/c++/14/istream:896:5: note:   template argument deduction/substitution failed:
a.cc:11:11: note:   'std::string' {aka 'std::__cxx11::basic_string<char>'} is not derived from 'std::basic_istream<_CharT, _Traits>'
   11 |   ss >> a+b;
      |           ^
/usr/include/c++/14/istream:939:5: note: candidate: 'template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(basic_istream<char, _Traits>&, unsigned char*)'
  939 |     operator>>(basic_istream<char, _Traits>& __in, unsigned char* __s)
      |     ^~~~~~~~
/usr/include/c++/14/istream:939:5: note:   template argument deduction/substitution failed:
a.cc:11:11: note:   'std::string' {aka 'std::__cxx11::basic_string<char>'} is not derived from 'std::basic_istream<char, _Traits>'
   11 |   ss >> a+b;
      |           ^
/usr/include/c++/14/istream:945:5: note: candidate: 'template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(basic_istream<char, _Traits>&, signed char*)'
  945 |     operator>>(basic_istream<char, _Traits>& __in, signed char* __s)
      |     ^~~~~~~~
/usr/include/c++/14/istream:945:5: note:   template argument deduction/substitution failed:
a.cc:11:11: note:   'std::string' {aka 'std::__cxx11::basic_string<char>'} is not derived from 'std::basic_istream<char, _Traits>'
   11 |   ss >> a+b;
      |           ^
/usr/include/c++/14/istream:1099:5: note: candidate: 'template<class _Istream, class _Tp> _Istream&& std::operator>>(_Istream&&, _Tp&&)'
 1099 |     operator>>(_Istream&& __is, _Tp&& __x)
      |     ^~~~~~~~
/usr/include/c++/14/istream:1099:5: note:   template argument deduction/substitution failed:
/usr/include/c++/14/istream: In substitution of 'template<class _Istream, class _Tp> _Istream&& std::operator>>(_Istream&&, _Tp&&) [with _Istream = std::__cxx11::basic_string<char>&; _Tp = int]':
a.cc:11:11:   required from here
   11 |   ss >> a+b;
      |           ^
/usr/include/c++/14/istream:1099:5: error: no type named 'type' in 'struct std::enable_if<false, void>'
 1099 |     operator>>(_Istream&& __is, _Tp&& __x)
      |     ^~~~~~~~
a.cc:12:10: error: 'std::string' {aka 'class std::__cxx11::basic_string<char>'} has no member named 'str'
   12 | cout<<ss.str().size()<<endl;
      |          ^~~