abc035b.rs

use std::io;
fn main() {
    let s = next_line();
    let s = s.trim();
    let t = getint();
    let mut cnt = 0;
    let mut x = 0;
    let mut y = 0;
    for c in s.chars() {
        match c {
            'L' => x = x - 1,
            'R' => x = x + 1,
            'D' => y = y - 1,
            'U' => y = y + 1,
             _  => cnt = cnt + 1,
        }
    }
    let x = if x < 0 { x * -1} else {x};
    let y = if y < 0 { y * -1} else {y};
    if t == 1 { 
        println!("{}", x + y + cnt);
    } else {
        let dist = x + y - cnt;
        let dist = if dist < 0 {(dist * -1) % 2} else { dist };
        println!("{}", dist);
    }
}

fn next_line() -> String {
    let mut input = String::new();
    io::stdin().read_line(&mut input).unwrap();
    input
}

fn getint() -> i32 {
    let res = next_line();
    let res = res.trim().parse().unwrap();
    res
}