#include<bits/stdc++.h>
using namespace std;
string s1,s2;
int main(){
cin>>s1>>s2;
if(s1.size()!=s2.size()){
cout<<"1";
return 0;
}
if(s1==s2){
cout<<2;
return 0;
}
for(int i=0;i<s1.size();i++){
if(s1[i]>='A'&&s1[i]<='Z'){
s1[i]+=32;
}
if(s2[i]>='A'&&s2[i]<='Z'){
s2[i]+=32;
}
}
if(s2==s1){
cout<<"3";
}
else{
cout<<"4";
}
return 0;
}
/**************************************************************
Problem: 1475
User: lixinglei
Language: C++
Result: Accepted
Time:36 ms
Memory:2076 kb
****************************************************************/