#include<bits/stdc++.h>
using namespace std
;
set
<string
> dict
;
int main(){
string s
,buf
;
int n
=4;
while(n
--){
cin
>>s
;
dict
.insert(s
);
}
for(set
<string
>::iterator it
=dict
.begin();it
!=dict
.end();++it
){
cout
<<*it
<<"\n";
}
return 0;
}
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