View Code of Problem 101

#include<iostream>
#include<string>
#include<cstring>
#include<math.h>
#include<algorithm>
using namespace std;

int main(){
	string s;
	int k=0;
	while(getline(cin,s)){
		string a,b;
		for(int i=0;i<s.length();i++){
			if(s[i]>='0'&&s[i]<='9'){
				a=s[i]+a;
			}
		}
//		cout<<a<<endl;
		for(int i=0;i<a.length();i++){
				b=a[i]+b;
			if((i+1)%3==0){
				b=','+b;
				
			}
		}
	   cout<<b<<endl;
	}
	return 0;
}