#include<bits/stdc++.h>
using namespace std;
int main()
{
	int ans=0;
	string a1,b1;
	cin>>a1>>b1;
	int a=a1.size(),b=b1.size();
	int i1=-1,j1=-1;
	while(true)
	{
		if(i1==a-1||j1==b-1) break;
		i1++;
		bool flag=true;
		for(int i=j1;i<=b;i++){
			if(b1[i]==a1[i1]){
				ans++;
				j1=i;
				break;
			}
		}
	}
	cout<<ans<<endl;
	return 0;
}