#include<iostream>\x0d #include<string>\x0d using namespace std;\x0d \x0d int main()\x0d {\x0d string s;\x0d while(cin>>s)\x0d {\x0d for(int i = 0 ; i < s.length() - 1 ; i++)\x0d {\x0d cout<<s[i];\x0d if((s.length() - 1 - i) % 3 == 0)\x0d cout<<",";\x0d }\x0d cout<<s[s.length() - 1]<<endl;\x0d }\x0d return 0;\x0d }\x0d
Note that non-ascii characters in the above source code will be escaped (such as \x9f).