Reverse Me! in Rust

// Code LNM 24 : Reverse Me!
// Author : warks

use std::io::{BufWriter, stdin, stdout, Write};

#[derive(Default)]
struct Scanner {
    buffer: Vec<String>
}

impl Scanner {
    fn next<T: std::str::FromStr>(&mut self) -> T {
        loop {
            if let Some(token) = self.buffer.pop() {
                return token.parse().ok().expect("Failed parse");
            }

            let mut input = String::new();
            stdin().read_line(&mut input).expect("Failed read");
            self.buffer = input.split_whitespace().rev().map(String::from).collect();
        }
    }
}

fn main() {
    let mut scan = Scanner::default();
    let out = &mut BufWriter::new(stdout());

    let t = scan.next::<usize>();
    for _ in 0..t {
        let n = scan.next::<usize>();

        let mut word = scan.next::<String>().chars().collect::<Vec<_>>();
        word = if word.len() & 1 == 1 { word.into_iter().rev().collect() } else { word };
        word[0] = word[0].to_uppercase().collect::<Vec<_>>()[0];
        write!(out, "{} ", word.into_iter().collect::<String>()).ok();

        for i in 1..n {
            word = scan.next::<String>().chars().collect::<Vec<_>>();
            word = if word.len() & 1 == 1 { word.into_iter().rev().collect() } else { word };
            write!(out, "{}", word.into_iter().collect::<String>()).ok();
            write!(out, "{}", if i + 1 == n { '\n' } else { ' ' }).ok();
        }
    }
}