#include<bits/stdc++.h>
using namespace std;
string a,b;
int main(){
cin>>a>>b;
if(a.size()!=b.size()){
cout<<1;
return 0;
}
if(a==b){
cout<<2;
return 0;
}
for(int i=0;i<=a.size();i++){
if(a[i]>='A'&&a[i]<='Z')a[i]+=32;
if(b[i]>='A'&&b[i]<='Z')b[i]+=32;
}
if(a==b){
cout<<3;
}
else{
cout<<4;
}
return 0;
}
/**************************************************************
Problem: 1475
User: xiaohongyi
Language: C++
Result: Accepted
Time:39 ms
Memory:2076 kb
****************************************************************/