#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
using namespace std;
int main() {
vector<string>v;
string str;
int mlen=0;
for(int i=0;i<5;i++){
cin>>str;
int size=str.size();
mlen=max(mlen,size);
v.push_back(str);
}
for(int i=0;i<mlen;i++){
for(int j=0;j<5;j++){
if(i>=v[j].size())
continue;
cout<<v[j][i];
}
}
return 0;
}
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