use std::io::{self, *};
pub fn main() {
let mut result_buffer = Vec::new();
let stdin = io::stdin();
let reader = BufReader::new(stdin.lock());
let mut lines = reader.lines();
let output = String::from_utf8(result_buffer).expect("无法解析为 UTF-8 字符串");
println!("{}", output);
}
#[cfg(test)]
mod tests {
use super::main;
#[test]
fn it_works() {
main();
}
}