#include<bits/stdc++.h>
using namespace std;
string s;
int ans,a[1000];
int main(){
	cin>>s;
	for(int i=0,x=-1; i<=s.size(); i++)
	{
		if(s[i]>='0'&&s[i]<='9'){x==-1?x=0:0;x*=10,x+=s[i]-'0';}
		else {x==-1?0:(!a[x]?ans++,a[x]++,x=-1:x=-1);}
	}
	cout<<ans;
	return 0;
}
//屎山代码

居然过了