#include <iostream>
using namespace std;

int main()
{
    char c[14];
    int count = 0,ans = 0;
    for(int i = 0; i < 14; i++){
        cin >> c[i]; 
        if(i > 0 && c[i] == 'o' && c[i-1] == 'o'){
            count++;
            if(ans <= count){
                ans = count + 1;
            }
        }else count = 0;
    }

    cout << ans << endl;

    return 0;
}