非常的简单好吧 因为懒 so：

#include<bits/stdc++.h>
using namespace std;
int main()
{
   string s;
   int ans=0;
   cin>>s;
   for(int i=0;i<s.size();i++)
   {
      if(s[i]=='a')ans+=1;
      if(s[i]=='b')ans+=3;
      if(s[i]=='c')ans+=5;
      if(s[i]=='d')ans+=7;
      if(s[i]=='e')ans+=9;
      if(s[i]=='f')ans+=11;
      if(s[i]=='g')ans+=13;
      if(s[i]=='h')ans+=15;
      if(s[i]=='i')ans+=17;
      if(s[i]=='j')ans+=19;
      if(s[i]=='k')ans+=21;
      if(s[i]=='l')ans+=23;
      if(s[i]=='m')ans+=25;
      if(s[i]=='n')ans+=27;
      if(s[i]=='o')ans+=29;
      if(s[i]=='p')ans+=31;
      if(s[i]=='q')ans+=33;
      if(s[i]=='r')ans+=35;
      if(s[i]=='s')ans+=37;
      if(s[i]=='t')ans+=39;
      if(s[i]=='u')ans+=41;
      if(s[i]=='v')ans+=43;
      if(s[i]=='w')ans+=45;
      if(s[i]=='x')ans+=47;
      if(s[i]=='y')ans+=49;
      if(s[i]=='z')ans+=51;
   }
   cout<<ans;
   return 0;
}

简单的暴力枚举