View Compilation Error

0_0_20664725_22571.cpp: In function 'int main()':
0_0_20664725_22571.cpp:9:11: error: 'cin' was not declared in this scope
     while(cin >> s) {  
           ^
0_0_20664725_22571.cpp:18:14: error: 'cout' was not declared in this scope
              cout << c.first << ":" << c.second << endl;                
              ^
0_0_20664725_22571.cpp:18:52: error: 'endl' was not declared in this scope
              cout << c.first << ":" << c.second << endl;                
                                                    ^