#include<iostream>
#include<cstring>
#include<cstdio>
using namespace std;
int main()
{
	string s1,s2;
	cin>>s1;cin>>s2;
	int a=0,b=0;
	int lena=s1.size(),lenb=s2.size();
	int len=lena<=lenb?lena:lenb;
	for(int i=1;i<=len;i++)
	
       if(s1.substr(0,i)==s2.substr(lenb-i,i))
         a=i;
    for(int i=1;i<=len;i++)
      if(s2.substr(0,i)==s1.substr(lena-i,i))
        b=i;
    
    int c=a>=b?a:b;
    cout<<c<<endl;
	return 0;	
}
/**************************************************************
	Problem: 2023
	User: admin
	Language: C++
	Result: Accepted
	Time:52 ms
	Memory:2076 kb
****************************************************************/