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#include<bits/stdc++.h>
using namespace std;
#define ll long long int
#define pb push_back
#define mod 1000000007
#define bg begin()
#define rbg rbegin()
#define ed end()
#define sz size()
#define ff first
#define ss second
#define fon for(i=0;i<n;i++)
#define foj for(j=0;j<n;j++)
#define JSM ios_base::sync_with_stdio(false);
int main()
{
    JSM
    ll t,n,m,x,y,p,q,i,j,k,answer=0;
    string s; cin>>s; set<string> ans; n=s.sz;
    for(i=0;i<=n;i++)
    {
        string a,b;
        a=s.substr(0,i);
        b=s.substr(i,n-i+1);
      //  cout<<a<<" "<<b<<endl;
        for(j=0;j<26;j++)
        {
            string ref="";
            ref+=a;
            ref+='a'+j;
            ref+=b;
            ans.insert(ref);
        }
    }

    cout<<ans.sz;
}