#include<iostream>
#include<cstring>
using namespace std;
int main()
{
string s="";
cin>>s;
int k=0;
bool a[s.length()];
for(int i=0;i<s.length();i++)
a[i]=0;
char min=s[0];
for(int i=1;i<s.length();i++)
{
if(s[i]<min)
min=s[i];
}
for(int i=1;i<s.length();i++)
{
if(s[i]<min)
min=s[i];
}
int c=0,j=0;
for(int i=0;i<s.length();i++)
{
if(s[i]==min)
{
a[i]=1;
c=i;
j++;
}
}
int r=0,f=0,e=0;
for(int i=0;i<s.length();i++)
{if(a[i]==1)
while(1)
{
if(a[i]==1)
{r++;
if(r==1)
f=i;
}
else{
e=1;
break;}
i++;
}
if(e==1)
break;
}
if(r>1){
printf("%d\n",f);
return 0;
}
if(j==1){
printf("%d\n",(c-k));
return 0;
}
else
{
min='z';
while(1)
{
for(int i=0;i<s.length();i++)
if(a[i]==1)
{
a[i]=0;
if(i<=s.length()-2)
{a[i+1]=1;
i++;}
else
a[0]=1;
}
for(int i=0;i<s.length();i++)
{ if(a[i]==1)
{
if(s[i]<min)
min=s[i];
}
}
int c=0,j=0;
for(int i=0;i<s.length();i++)
{
if(a[i]==1)
if(s[i]==min)
{
a[i]=1;
if(i==0)
c=s.length()+i;
else
c=i;
j++;
}
else
a[i]=0;
}
if(j==1){
printf("%d\n",(c-k-1));
return 0;}
else
{
min='z';
k++;
continue;
}
}
}
}
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