// editor2
#include <iostream>
#include <string>
#include <vector>
#include <sstream>
#include <algorithm>
using namespace std;
int main(){
    string s;
    if(!getline(cin,s))return 0;
     for(char c : s){
         if(!isalpha(c) && !isspace(c))
         {
             cout<<"Invalid input"<<endl;
             return 0;
         }
     }
     vector<string> words;
     stringstream ss(s);
     string word;
     int maxLen = 0;
     
     while(ss>>word){
         words.push_back(word);
         maxLen = max(maxLen, (int)word.length());
     }
     if(words.empty()) return 0;
     
     for (int i=0;i<maxLen; ++i){
         string row = " ";
         for(const strings& w : words){
        
           if(i < w.length()){
              row+=w[i];
            }
            else{
              row+=" ";
            }
        }
    }
     size_t last = row.find_last_not_of(' ');
     if(last != string::npos){
         cout<<row.substr(0 , last + 1)<<endl;
     }
     else if(!row.empty(){
         
     }
     return 0;
    
}