use std::io::{self, stdin, Read, StdinLock}; struct Input { a: i32, b: i32, } fn read_input(cin_lock: &mut StdinLock) -> Input { Input { a: next_token(cin_lock).parse().unwrap(), b: next_token(cin_lock).parse().unwrap(), } } fn solve(input: Input) { for c in input.a..input.b { let d = c.to_string().chars().collect::>(); if c % 3 == 0 || d.iter().find_map(|x| Some(x.to_string() == "3")).unwrap().to_string() == "3" { println!("{}", c); } } } fn next_token(cin_lock: &mut io::StdinLock) -> String { cin_lock .by_ref() .bytes() .map(|c| c.unwrap() as char) .skip_while(|c| c.is_whitespace()) .take_while(|c| !c.is_whitespace()) .collect::() } fn main() { let cin = stdin(); let mut cin_lock = cin.lock(); let input = read_input(&mut cin_lock); solve(input); }