fn main() {
    for i in 0..1000{
        let mut x= i.to_string();

        while x.len()<3{
            x="0".to_string()+&x.to_string();
        }

        println!("{}",x);

        let s: Vec<char> = {
            let mut line: String = String::new();
            std::io::stdin().read_line(&mut line).unwrap();
            line.trim().chars().collect()
        };

        if s[0]=='u'{
            break;
        }
    }
}