#include<iostream>
using namespace std;
int main(){
    char c[100];
    int i = 0;
    int count=0,temp=0;
    
    while(cin >> c[i]){
        
        if(c[i]=='o'){
            
            count++;//up
            if(temp < count){//bigger than temp
                temp = count;//save
            }
            
        }else{
            count = 0;//reset
        }
        i++;
    }
    cout << temp << endl;
    
    return 0;
}