#include <bits/stdc++.h> using namespace std; char s[20]; int main(){ cin>>(s+1); int n=strlen(s+1); int ans=100; for(int sta=1;sta<(1<<n);sta++){ int tmp=0,cnt=0; for(int i=n-1;i>=0;i--){ int flag=(sta>>i)&1; if(flag0) tmp++; else cnt+=s[i+1]-'0'; } if(cnt%30) ans=min(ans,tmp); } if(ans==100) cout<<"dottle bot"; else cout<<ans; return 0; }