求大佬调试

#include <iostream>
#include <string>

using namespace std;

int main()
{
	string WordMax, WordMin;
	
	string str;
	while(cin >> str)
	{
		if(str.back() == ',' || str.back() == '.') str.pop_back();
		
		if(str.size() > WordMax.size()) WordMax = str;
		if(str.size() < WordMin.size() || WordMin.empty()) WordMin = str; 
	}
	
	cout << WordMax << endl << WordMin << endl;
	
	return 0;
}