fn main() {
    let mut input = String::new();
    std::io::Read::read_to_string(&mut std::io::stdin(), &mut input).ok();
    let input: Vec<String> = input
        .split_whitespace()
        .skip(1)
        .map(|n| n.parse().unwrap())
        .collect();

    let n = input.len() / 2;
    let i_diff = (0..n).find(|&i| input[i] != input[n + i]).unwrap();

    println!("{}", i_diff + 1);
    println!("{}", input[i_diff]);
    println!("{}", input[n + i_diff]);
}