use std::io;

fn main() {
    let mut n = String::new();
    io::stdin().read_line(&mut n).ok();
    let n: usize = n.trim().parse().unwrap();

    let mut r: Vec<usize> = vec![0; 1000];

    for _ in 0..n {
        let mut s = String::new();
        io::stdin().read_line(&mut s).ok();
        let x: usize = s.trim().len() - 2;
        r[x] += 1;
    }
    
    println!("{}",
        999-r.iter().rev().position(|x| x == r.iter().max().unwrap()).unwrap()
    );
}