#include<iostream>
#include<algorithm>
#include<string>
using namespace std;
string a,b;
int main()
{
	int flag=0;
	cin>>a>>b;
	for(int i=0;i<max(a.size(),b.size());i++)
	 if(a[i]!=b[i])  {
	 	               cout<<a[i]-b[i]<<endl;
	 	               flag=
 
1;
	 	               break;
	                 }
	 if(flag==0)  cout<<0<<endl;
	return 0;
 }

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