P1765非打表0pts求助

#include <iostream>
#include <cstdio>
#include <cmath>
#include <algorithm>
#include <string>
#include <cstring>
using namespace std;
string a;
int mod[1000]={2,3,1},len,ans;
int main()
{
    getline(cin,a);
    len = a.length();
    for (int i=0;i<len;i++)
    {
        if (a[i]=='s'||a[i]=='z') ans+=4;
        else if (a[i]==' ') ans+=1;
        else
        {
            if (a[i]<'s')
            {
                ans+=(a[i]-96)%3;
                if ((a[i]-96)%3==0) ans+=3;
            }
            else if (a[i]>'s')
            {
                ans+=mod[(a[i]-96)%3];
            }
        }
    }
    printf ("%d\n", ans-1);
    return 0;
}