use std::io::{self, Read};

fn main() {
    let mut cc = String::new();
    io::stdin().read_to_string(&mut cc).ok();
    let cc = cc.chars().filter(|&c| c != '\n').collect::<Vec<_>>();

    let (mut max, mut seq) = (0, 0);
    for &c in &cc {
        if c == 'o' {
            seq += 1;
            max = max.max(seq);
        } else {
            seq = 0;
        }
    }

    println!("{}", max);
}