#![allow(unused)] use kyoproio::*; use std::{ collections::*, io::{self, prelude::*}, iter, mem::{replace, swap}, }; fn main() -> io::Result<()> { std::thread::Builder::new() .stack_size(50 * 1024 * 1024) .spawn(solve)? .join() .unwrap(); Ok(()) } fn solve() { let stdin = io::stdin(); let mut kin = Input::new(stdin.lock()); let stdout = io::stdout(); let mut out = io::BufWriter::new(stdout.lock()); macro_rules! output { ($($args:expr),+) => { write!(&mut out, $($args),+) }; } macro_rules! outputln { ($($args:expr),+) => { output!($($args),+); outputln!() }; () => { output!("\n"); if cfg!(debug_assertions) { out.flush(); } } } let mut x = kin.bytes().to_owned(); x.sort(); x.reverse(); let n = x.len(); let mut swapped = false; for i in (0..n - 1).rev() { if x.get(i) != x.last() { x.swap(i, i + 1); swapped = true; break; } } if swapped && x.first() != Some(&b'0') { outputln!("{}", String::from_utf8_lossy(&x)); } else { outputln!("-1"); } } // ----------------------------------------------------------------------------- pub mod kyoproio { #![warn(unused)] pub use std::io::prelude::*; pub struct Input { src: R, buf: String, pos: usize, } impl Input { pub fn new(src: R) -> Self { Self { src, buf: String::with_capacity(1024), pos: 0, } } pub fn str(&mut self) -> &str { loop { if self.pos >= self.buf.len() { self.buf.clear(); let len = self.src.read_line(&mut self.buf).expect("io error"); self.pos = 0; if len == 0 { return &self.buf; } } let range = self.pos ..self.buf[self.pos..] .find(|c: char| c.is_ascii_whitespace()) .map(|i| i + self.pos) .unwrap_or(self.buf.len()); self.pos = range.end + 1; if range.end - range.start > 0 { return &self.buf[range]; } } } pub fn bytes(&mut self) -> &[u8] { self.str().as_ref() } pub fn input(&mut self) -> T { self.input_fallible().expect("input error") } pub fn input_fallible(&mut self) -> Result { T::input(self) } pub fn iter(&mut self) -> Iter { Iter { input: self, _t: std::marker::PhantomData, } } } pub struct Iter<'a, T, R> { input: &'a mut Input, _t: std::marker::PhantomData, } impl<'a, T: InputParse, R: BufRead> Iterator for Iter<'a, T, R> { type Item = T; fn next(&mut self) -> Option { Some(self.input.input()) } } type Result = std::result::Result>; pub trait InputParse: Sized { fn input(input: &mut Input) -> Result; } macro_rules! input_from_str_impls { { $($T:ty)* } => { $(impl InputParse for $T { fn input(input: &mut Input) -> Result { input.str().parse::<$T>().map_err(|e| e.into()) } })* }; } macro_rules! input_tuple_impls { { $(($($T:ident),+))* } => { $(impl<$($T:InputParse),+> InputParse for ($($T),+) { fn input(input: &mut Input) -> Result { Ok(($($T::input(input)?),+)) } })* }; } input_from_str_impls! { String char bool f32 f64 isize i8 i16 i32 i64 i128 usize u8 u16 u32 u64 u128 } input_tuple_impls! { (A, B) (A, B, C) (A, B, C, D) (A, B, C, D, E) (A, B, C, D, E, F) (A, B, C, D, E, F, G) } }