#include<iostream>
#include<string>
using namespace std;int main(){string q,b,p,d,a="-1";cin>>q>>b>>p>>p>>d;int g=b.size(),h=d.size(),i;if(g>h)a=q;else if(g==h){for(i=0;i<g;i++){if(b[i]>d[i]){a=q;break;}else if(b[i]<d[i]){a=p;break;}}}else a=p;cout<<a;}