View Compilation Error

0_0_34893417_15133.cpp: In function 'int main()':
0_0_34893417_15133.cpp:17:15: error: 'class std::set<std::basic_string<char> >' has no member named 'inset'
             B.inset(s2);
               ^
0_0_34893417_15133.cpp:19:25: error: 'class std::set<std::basic_string<char> >' has no member named 'zize'
         if(A.size() - B.zize() == 1)
                         ^