#![allow(non_snake_case)]

#[allow(unused_macros)]
macro_rules! input {
    (source = $s:expr, $($r:tt)*) => {
        let mut tokens = $s.split_whitespace();
        input_inner! { tokens, $($r)* }
    };

    ($($r:tt)*) => {
        let s = {
            use std::io::Read;
            let mut res = String::new();
            ::std::io::stdin().read_to_string(&mut res).unwrap();
            res
        };
        let mut tokens = s.split_whitespace();
        input_inner! { tokens, $($r)* }
    };
}

#[allow(unused_macros)]
macro_rules! input_inner {
    ($tokens:expr)  => {};
    ($tokens:expr,) => {};

    ($tokens:expr, $var:ident : $t:tt $($r:tt)*) => {
        let $var = read_value!($tokens, $t);
        input_inner! { $tokens $($r)* }
    };
}

#[allow(unused_macros)]
macro_rules! read_value {
    ($tokens:expr, ( $($t:tt),* )) => {
        $(read_value!($tokens, $t)),*
    };

    ($tokens:expr, [ $t:tt; $len:expr ]) => {
        (0..$len).map(|_| read_value!($tokens, $t)).collect::<Vec<_>>()
    };

    ($tokens:expr, chars) => {
        read_value!($tokens, String).chars().collect::<Vec<_>>()
    };

    ($tokens:expr, usize1) => {
        read_value!($tokens, usize) - 1
    };

    ($tokens:expr, $t:ty) => {
        $tokens.next().unwrap().parse::<$t>().expect("parse error")
    };
}

fn main() {
    input! {
        N: usize,
    }

    let mut words = vec![Vec::<String>::new(); 13];
    for b1 in b'a'..b'n' {
        for b2 in b'a'..b'n' {
            for b3 in b'a'..b'n' {
                for b4 in b'a'..b'n' {
                    for b5 in b'a'..b'n' {
                        let bytes = [b1,b2,b3,b4,b5];
                        let word = String::from_utf8_lossy(&bytes);
                        words[(b1-b'a') as usize].push(word.to_string());
                    }
                }
            }
        }
    }

    let mut head = 0;
    for _ in 0..N-1 {
        let word = words[head].pop().unwrap();
        head = (word.as_bytes()[word.len()-1] - b'a') as usize;
        println!("{}", word);
    }

    let mut word = words[head].pop().unwrap();
    word.push('n');
    println!("{}", word);
}