View Compilation Error

0_0_33372308_3848.cpp: In function 'int main()':
0_0_33372308_3848.cpp:14:3: error: 'cout' was not declared in this scope
   cout<<len2<<endl;
   ^
0_0_33372308_3848.cpp:14:15: error: 'endl' was not declared in this scope
   cout<<len2<<endl;
               ^