View Code of Problem 101

#include <cstdio>
#include <iostream>
#include <string>
#include <sstream>

using namespace std;

int main(){
	string str;
	while(cin>>str){
		if(str.length()<=3){
			cout<<str<<endl;
			continue;
		}
		stringstream ss(str);
		string temp;
		string end;
		while(getline(ss,temp,',')){
			end+=temp;//凭接 
		}
		int len=end.length();
		int n=len%3;
		int count=0;
		for(int i=0;i<n;i++){
			cout<<end[i];
		}
		if(n!=0){
			cout<<",";
		}
		for(int i=n;i<len;i++){
			if(count<2||i==len-1){
				cout<<end[i];
				count++;
			}
			else if(count==2){
				cout<<end[i]<<",";
				count=0;
			}
			
			
		} 
		cout<<endl;
	}
	return 0;
}