#include<bits/stdc++.h> using namespace std; int x[200],c,i,y[200],j,k; char a[200],b[200]; int main(){ cin>>a; cin>>b; for(i=0;a[i]!='\0';i++){ x[i]=a[i]; j++; } for(i=0;b[i]!='\0';i++){ y[i]=b[i]; k++; } if(k==j){ for(i=0;a[i]!='\0';i++){ if(a[i]==b[i]){ c=2; }else if(x[i]+32==y[i]||x[i]-32==y[i]){ cout<<3; c=1; break; }else{ cout<<4; c=1; break; } } if(c!=1){ cout<<2; } }else{ cout<<1; } return 0; }