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#include <bits/stdc++.h>
 
using namespace std;

int isAnagram (string s){
    map<char, int>m;
    for (int i=0; i<s.size(); i++){
        m[s[i]]++;
    }
    int count = 0;
    for (int i=0; i<s.size()/2; i++){
        if (m[s[i]] == 1) count++;
    }
    return count;
}

int main() {
	string s;
	cin>>s;
	cout<<isAnagram(s)<<endl;
	return 0;
}