#include <iostream>
#include <string>
using namespace std;

class Solution {
public:
    string defangIPaddr(string address) {
        for(string::size_type i = 0; i < address.size(); ++i){
            if(address[i] == '.'){
                address.replace(i, 1, "[.]");
                i += 2;
            }
        }
        return address;
    }
};

int main()
{
	Solution s;
    cout << s.defangIPaddr("127.0.0.1");
	return 0;
}