#include <iostream>
#include <string>
using namespace std;
int main() {
    string a, b, c;
    cin>> a >> b >> c;
    if(a.length()<=30 && b.length()<=30 && c.length()<=30){
    if (a<b && a<c && a!=b && a!=c){
        cout<<a;
    }
    if (b<a && b<c && b!=c )
    {
        cout<<b;
    }
    if (a==b && b<c){
        cout<<b;
        }
    if(b==c && a>b){
        cout<<b;
      }
    if(c<b && a>c && c!=b && a!=c){
        cout<<c;}
    if (a==b&&b==c){
     cout<<c;}}
    else
           return 0;
}