#include<iostream> #include<cstring> using namespace std; int main(){ string a,b; int x,z=0; cin>>a>>b; if(a.size()!=b.size()){ x=1; } else{ if(a==b){ x=2; } else{ for(int i=0;i<a.size();i++){ if(a[i]>=65&&a[i]<=90){ a[i]=a[i]+32; } if(b[i]>=65&&b[i]<=90){ b[i]=b[i]+32; } if(a[i]==b[i]){ z=z+1; } } if(z==a.size()){ x=3; } else{ x=4; } } } cout<<x; return 0; }