#include<bits/stdc++.h>

 using namespace std;

 typedef long long LL;

 class NamingConvention{

 public:

     string toCamelCase(string str) {

         string res; res.clear();

         for (int i=; i<str.size(); ++i) {

             if (str[i] == '_') continue;

             else if (i >=  && str[i - ] == '_') res.push_back(str[i] + 'A' - 'a');

             else res.push_back(str[i]);

         }

         return res;

     }

 };