use std::{ char, io::{self, *}, }; fn main() { let stdin = io::stdin(); unsafe { let mut s = String::new(); let mut flag = 0; for line in stdin.lock().lines() { let ll = line.unwrap(); if (flag == 1) { let c = ll.parse::<char>().unwrap().to_ascii_lowercase(); let res = s .as_bytes() .iter() //...