View Compilation Error

0_0_26204021_4054.cpp: In function 'int main()':
0_0_26204021_4054.cpp:12:17: error: cannot convert 'std::basic_string<_CharT, _Traits, _Alloc>::length<char, std::char_traits<char>, std::allocator<char> >' from type 'std::basic_string<char>::size_type (std::basic_string<char>::)() const noexcept {aka long long unsigned int (std::basic_string<char>::)() const noexcept}' to type 'int'
     int len = s.length;
                 ^