#include <iostream>
#include <bits/stdc++.h>
using namespace std;
int main()
{
	string a,b;
	getline(cin,a);
	getline(cin,b);
	int flag;
	int len1 = a.length();
	int len2 = b.length();
	if(len1 == len2){
		for(int i = 0 ;i < len1 ;i++){
			if(a[i] != b[i]){
				if(a[i] + 32 == b[i] || a[i] - 32 == b[i]){
					flag = 3;
				}else{
					flag = 4;
				}
			}
		}
		if(a==b){
			flag = 2;
		}
	}else{
		flag = 1;
	}
	cout << flag;
	return 0;
}