View Code of Problem 101

#include<iostream>
#include<math.h>
#include<string>
#include<cstring>
#include<algorithm>
#include<cmath>
using namespace std;
int main(){
	string h;
	while(cin>>h)
	{
		int len=3;
		while(h.find(',')!=-1)
		{
			h.erase(h.find(','),1);
		}
		for(int i=h.length()-1;i>=0;i--)
		{
						len--;
			if(len==0)
			{
				len=3;
				h.insert(i,",");
				//i--;
			}

		}
		cout<<h<<endl;
	 } 
	return 0;
}