#include <bits/stdc++.h>
using namespace std;
typedef long long LL;
int A[260005],B[260005],C[260005];
string mul(string a,string b){
    string ans;
    if (a=="0"||b=="0"){return "0";}
    memset(C,0,sizeof C);
    reverse(a.begin(),a.end());
    reverse(b.begin(),b.end());
    int sizeans=a.size()+b.size(),asize=a.size(),bsize=b.size();
    for (int i=1;i<=asize;++i){
        A[i]=a[i-1]^48;
    }
    for (int i=1;i<=bsize;++i){
        B[i]=b[i-1]^48;
    }
    for (int i=1;i<=asize;++i){
        for (int j=1;j<=bsize;++j){
            C[i+j-1]+=A[i]*B[j];
        }
    }
    for (int i=1;i<=sizeans;++i){
        C[i+1]+=C[i]/10;C[i]%=10;
    }
    while ((sizeans>1)&&(!(C[sizeans]))){--sizeans;}
    for (int i=sizeans;i>=1;--i){ans+=(char)(C[i]^48);}
    return ans;
}
string add(string a,string b){
    memset(A,0,sizeof A);
    memset(B,0,sizeof B);
    memset(C,0,sizeof C);
    for (int i=a.size(),j=0;i>=1;--i,++j){A[j]=a[i-1]^48;}
    for (int i=b.size(),j=0;i>=1;--i,++j){B[j]=b[i-1]^48;}
    int sss=max(a.size(),b.size())+1;
    for (int i=0;i<=sss;++i){
        C[i]+=A[i]+B[i];C[i+1]+=C[i]/10;C[i]%=10;
    }
    bool ok=0;
    string ans="";
    for (int i=sss;~i;--i){ok|=C[i];if (ok){ans+=(char)(C[i]^48);}}
    return (ans.size())?ans:"0";
}
char s[505];
string ans="0";
int main(){
    scanf("%s",s+1);
    int t;
    for (int i=1;s[i];++i){
        ans=mul(ans,"26");t=s[i]-'a'+1;if (t==26){t=0;ans=add(ans,"26");}ans=add(ans,to_string(t));
    }
    puts(ans.c_str());
    return 0;
}