#[allow(unused_imports)]
use std::cmp;
#[allow(unused_imports)]
use std::collections::BTreeSet;
#[allow(unused_imports)]
use std::collections::HashMap;
#[allow(unused_imports)]
use std::collections::HashSet;
use std::fmt::Display;
use std::fs::File;
use std::io::Read;
#[allow(unused_imports)]
use std::mem;

#[allow(dead_code)]
fn pow_speedy_with_mod(mut p: i64, mut q: i64, m: i64) -> i64 {
    p %= m;
    let mut r = p;
    let mut ret: i64 = 1;
    while q > 0 {
        ret *= if q % 2 == 1 { r } else { 1 };
        r *= r;
        r %= m;
        q /= 2;
        ret %= m;
    }
    return ret;
}

#[allow(dead_code)]
fn comb(n: usize, k: usize, m: i64, frac: &[i64], frac_inv: &[i64]) -> i64 {
    let mut ret = 1i64;
    if n < k {
        return 0;
    }
    ret *= frac[n] * frac_inv[n - k];
    ret %= m;
    ret *= frac_inv[k];
    ret %= m;
    ret
}

#[allow(dead_code)]
fn show1dvec<T: Display>(v: &Vec<T>) {
    let n = v.len();
    for i in 0..n - 1 {
        print!("{} ", v[i]);
    }
    println!("{} ", v[n - 1]);
}

#[allow(dead_code)]
fn check(i: usize, j: usize, h: usize, w: usize) -> bool {
    i < h && j < w
}

#[derive(Debug)]
struct Piece {
    mark: char,
    y: i32,
    x: i32,
}

fn main() {
    let inputstatus = 1;

    let mut buf = String::new();
    let filename = "inputrust.txt";

    if inputstatus == 0 {
        let mut f = File::open(filename).expect("file not found");
        f.read_to_string(&mut buf)
            .expect("something went wrong reading the file");
    } else {
        std::io::stdin().read_to_string(&mut buf).unwrap();
    }

    let mut iter = buf.split_whitespace();
    let s: Vec<char> = iter.next().unwrap().chars().collect();
    let t: Vec<char> = "abcdefghijklmnopqrstuvwxyz".chars().collect();

    for i in 0..26 {
        if s[i] != t[i] {
            println!("{}to{}", t[i], s[i]);
        }
    }

    // let n = iter.next().unwrap().parse().unwrap();

    // println!("{}", n);
    // println!("{:?}", cum_num);
}