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

    let mut xx = String::new();
    std::io::stdin().read_line(&mut xx).ok();
    let xx: Vec<usize> = xx.split_whitespace().flat_map(str::parse).collect();

    s.swap(xx[0], xx[1]);
    let s: String = s.iter().collect();

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