#[macro_use]
mod input {

use std;
use std::io;

const SPLIT_DELIMITER: char = ' ';

#[macro_export]
#[allow(unused_macros)]
macro_rules! input {
    ( $($x:expr ),*) => {
        {
            let temp_str = input_line_str();
            let mut split_result_iter = temp_str.split_whitespace();
                $(
                let buf_split_result = split_result_iter.next();
                let buf_split_result = buf_split_result.unwrap();
                    ($x) = buf_split_result.parse().unwrap();
                )*
        }
    };
}

#[allow(dead_code)]
pub fn input_line_str() -> String {
    let mut s = String::new();
    io::stdin().read_line(&mut s).unwrap();
    s.trim().to_string()
}

#[allow(dead_code)]
pub fn p<T>(t: T)
where
    T: std::fmt::Display,
{
    println!("{}", t);
}

#[allow(dead_code)]
pub fn input_vector2d<T>(line: usize) -> Vec<Vec<T>>
where
    T: std::str::FromStr,
{
    let mut v: Vec<Vec<T>> = Vec::new();

    for _ in 0..line {
        let vec_line = input_vector();
        v.push(vec_line);
    }
    v
}

#[allow(dead_code)]
pub fn input_vector<T>() -> Vec<T>
where
    T: std::str::FromStr,
{
    let mut v: Vec<T> = Vec::new();

    let s = input_line_str();
    let split_result = s.split(SPLIT_DELIMITER);
    for z in split_result {
        let buf = match z.parse() {
            Ok(r) => r,
            Err(_) => panic!("Parse Error"),
        };
        v.push(buf);
    }
    v
}

#[allow(dead_code)]
pub fn str2vec(s: &str) -> Vec<char> {
    let mut v: Vec<char> = Vec::new();
    for c in s.chars() {
        v.push(c);
    }
    v
}

}

use input::*;

fn boundary_check(x: isize, y: isize, w: isize, h: isize) -> bool {
    if 0 <= x && x < w && 0 <= y && y < h {
        true
    } else {
        false
    }
}

fn search_bomb(v: &Vec<Vec<char>>, x: isize, y: isize, w: isize, h: isize) -> isize {
    let mut num = 0;
    if boundary_check(x - 1, y - 1, w, h) && v[(y - 1) as usize][(x - 1) as usize] == '#' {
        num += 1;
    }
    if boundary_check(x - 1, y, w, h) && v[y as usize][(x - 1) as usize] == '#' {
        num += 1;
    }
    if boundary_check(x - 1, y + 1, w, h) && v[(y + 1) as usize][(x - 1) as usize] == '#' {
        num += 1;
    }
    if boundary_check(x, y - 1, w, h) && v[(y - 1) as usize][x as usize] == '#' {
        num += 1;
    }
    if boundary_check(x, y + 1, w, h) && v[(y + 1) as usize][x as usize] == '#' {
        num += 1;
    }
    if boundary_check(x + 1, y - 1, w, h) && v[(y - 1) as usize][(x + 1) as usize] == '#' {
        num += 1;
    }
    if boundary_check(x + 1, y, w, h) && v[y as usize][(x + 1) as usize] == '#' {
        num += 1;
    }
    if boundary_check(x + 1, y + 1, w, h) && v[(y + 1) as usize][(x + 1) as usize] == '#' {
        num += 1;
    }
    num
}

fn main() {
    let (h, w): (isize, isize);
    input!(h, w);
    let mut ans = vec![vec![10; w as usize]; h as usize];
    let mut v = Vec::new();
    for _ in 0..h {
        let s = str2vec(&input_line_str());
        v.push(s);
    }
    for i in 0..h {
        for j in 0..w {
            ans[i as usize][j as usize] = search_bomb(&v, j, i, w, h);
        }
    }
    for i in 0..h {
        for j in 0..w {
            if v[i as usize][j as usize] == '.' {
                print!("{}", ans[i as usize][j as usize]);
            } else {
                print!("#");
            }
        }
        println!("");
    }
}

Measured memory_bytes: 4352