View Code of Problem 101

#include<cstdio>
#include<iostream>
#include<algorithm>
#include<cmath>
#include<cstring>
#include<vector>
#include<map>
#include<string>
#include<set>
using namespace std;
int main(){
    string s;
    while(cin>>s)
    {
        int cnt=0;
        for(int i=0;i<s.length();i++)
        {
            if(s[i]==',')cnt++;
        }
        int l=s.length()-cnt;
        l=3-l%3;
//cout<<l<<endl;
        for(int i=0;i<s.length();i++)
        {
            if(s[i]!=','){
                l++;
                if(l%3==1&&i!=0)cout<<",";
                cout<<s[i];

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