#include<iostream>
    #include<algorithm>
    #include<vector>
    #include<set>
    #include<limits.h>
    #include<map>
    #include<stack>
    #include<stdio.h>
    #include<queue>
    #include<math.h>
    #include<string.h>
    #include<sstream>

    using namespace std;
    #define fast ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    #define LL long long int
    #define pb push_back
    #define mp make_pair
    #define ff first
    #define ss second
    #define PII pair<int,int>
    #define PLL pair<LL,LL>
    #define VSP vector<set<PLL > > 
    #define PIS pair< int,string>

int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */
    fast
    int n,i,j,x,f=0,t=0,p,f1=0;
    string s;
    cin>>s;
    n = s.length();
    for(x=1;x<n-1;x++)
    {
        if(s[x]=='E' && (s[x-1]=='E' ||s[x+1]=='E'))
            f1=1;
        if(s[x]=='E')
            p=x;
    }
   // cout<<f1<<"\n";
    if(f1!=1)
        cout<<p;
    else
    if(s[0]=='E' || s[n-1]=='E')
        {
            if(s[n-1]=='E')
                 cout<<n-1;
            else
                cout<<0;
    }
    else
    {    
        for(x=0;x<s.length();x++)
        {
            if(s[x]=='O' && s[x+2]!='O')
            {
                
                f=1;
                cout<<x+2;
                break;
                
            }
         }  
        
            
    }
    
    return 0;
}