#include<iostream>

#include<string.h>

#include<stdio.h>

using namespace std;

const int maxa = ;

char str[maxa];

int dp[][];

int main(){

    for(int i = ; i < ; i++){

        for(int k = ; k <= ; k++){

            if(i == ) dp[i][k] = ;

            else for(int j = ; j < k; j++)dp[i][k] += dp[i-][j];

           /// cout<<dp[i][k]<<" ";

        }

    //puts("");

    }

    char str[];

    while(scanf("%s", str)!=EOF){

        int ok = ;

        for(int i = ; str[i]; i++){

            if(str[i] <= str[i-])

                ok = ;

        }

        if(ok){

            cout<<<<endl;continue;

        }

        int n = strlen(str);

        int ans = ;

        for(int i = ; str[i]; i++){

            for(int k =i == ?:str[i-]-'a'+; k < str[i]-'a'; k++){

                ans += dp[n--i][-k];

            }

        }

        int m = ;

        //cout<<ans<<endl;

        for(int i = ; i < n-; i++){

            ans += dp[i+][+];

        }

        cout<<ans<<endl;

    }

}