import * as fs from 'fs';
const input = fs.readFileSync('/dev/stdin', 'utf8');

const abc = ['abcdefghijklmnopqrstuvwxyz'];
const incor = input.split('');
const cor = abc[0].split('');

for (let i = 0;i < cor.length; i++) {
    if (incor[i] !== cor[i]) {
        console.log(`${cor[i]}to${incor[i]}`);
    }
}