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use std::io;
use std::io::BufRead;
pub trait USIInputReader {
fn read(&mut self) -> io::Result<String>;
}
pub struct USIStdInputReader {
}
impl USIStdInputReader {
pub fn new() -> USIStdInputReader {
USIStdInputReader {
}
}
}
impl USIInputReader for USIStdInputReader {
fn read(&mut self) -> io::Result<String> {
let stdin = io::stdin();
let mut lock = stdin.lock();
let mut buf = String::new();
lock.read_line(&mut buf)?;
let ptn:&[_] = &['\r','\n'];
Ok(buf.as_str().trim_end_matches(ptn).to_string())
}
}