整活

#include<bits/stdc++.h>
using namespace std;
int main(){
    bool b = 1;
    string s1,s2;
    cin >> s1 >> s2;
    if(s1.size()!=s2.size()){
        cout<<1;
        return 0;
    }
    else {
        int i = -1;
        for_:
            i++;
            if(abs(s1[i]-s2[i])!=32&&abs(s1[i]-s2[i])!=0){
                cout << 4;
                b = 0;
            }
            else if(abs(s1[i]-s2[i])==32&&abs(s1[i]-s2[i])!=0){
                cout << 3;
                b = 0;
            }
            if(b&&i<s1.size()-1)goto for_;
    }
    if(b)cout <<2;
}