#include <bits/stdc++.h>
using namespace std;
int main(){
string s1,s2;
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(s1==s2){
cout<<3;
return 0;
}
else{
cout<<4;
}
return 0;
}
/**************************************************************
Problem: 1475
User: chenhongen
Language: C++
Result: Accepted
Time:35 ms
Memory:2076 kb
****************************************************************/