#include<iostream>
#include<vector>
#include<sstream>
using namespace std;

int main()
{
    string s;
    getline(cin,s);
    
    for (char c : s)
     if(!(isalpha(c) || c == ' '))
     {
         cout << "Invalid input";
         return 0;
     }
}
 vector<string>words;
 string word;
 stringstream ss(s);
 while(ss >> word)
 {
     words.push_back(word);
 }
 int maxLen = 0;
 for (string w : words)
 {
     if(w.length()>maxLen)
     maxLen = w.length();
 }
 for(int i = 0; i < maxLen;i++)
 {
     for(int j = 0;j< words.size();j++)
     {
     if(i<words[j].length())
     cout<<words[j][i];
     else
     cout<<" ";
     }
 }
         cout<<endl;
     return 0;
 }