#include<iostream>
#include<vector>
#include<string>
#include<sstream>
#include<algorithm>
using namespace std;
int main(){
    string input;
    if(!getline(cin,input)||input.empty())return 0;
    for(char c:input){
        if(!isalpha(c)&&c!='){
            cout<<"Invalid input"<<endl;
            return 0;
        }
}
vector<string>words;
stringstream ss(input);
string word;
int maxLen=0;
while(ss>>word){
    words.push_back(word);
    maxLen=max(int)word.length(),maxLen);
    for(int i=0;i<maxLen;++i){
        string line="";
        for(const string&w:words){
            if(i<w.length()){
                line+='';
            }
        }
        size_t last=line.find_last_not_of('');
        if(last!=string::npos){
            cout<<line.substr(0,last+1)<<endl;
        }
}
return 0;
}