#include<bits/stdc++.h>
using namespace std;
int main(){
	int a,b,sum=0,;
	cin>>a>>b;
	for(int i=a;i<=b;i++){
		int c=i;
		int s=i;
		while(s==0){
			int e=0;
			e+=s%10;
			s/10;
	}
}
cout<<4;
	return 0;
}