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using namespace std;
#include <algorithm>
#include <iostream>
#include <iterator>
#include <numeric>
#include <sstream>
#include <fstream>
#include <cassert>
#include <climits>
#include <cstdlib>
#include <cstring>
#include <string>
#include <cstdio>
#include <vector>
#include <cmath>
#include <queue>
#include <deque>
#include <stack>
#include <list>
#include <map>
#include <set>

#define foreach(x, v) for (typeof (v).begin() x=(v).begin(); x !=(v).end(); ++x)
#define For(i, a, b) for (int i=(a); i<(b); ++i)
#define D(x) cout << #x " is " << x << endl

string letters [27];
map <string, int> index;

int oneLetterWords(){
        int last;
        for (int i = 1; i < 27; i++){
                index[letters[i]] = i;
                last = i;
        }
        return last;
}

int main(){

        letters[0] = "";
        for (int i = 1; i < 27; i++){
                char c = (char) (i - 1 + 'a');
                letters[i] = c;
        }
        cout << oneLetterWords() << endl;
        /*twoLetterWords();
        threeLetterWords();
        fourLetterWords();
        fiveLetterWords();*/
    return 0;
}