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

const nlarray = input.split('\n');
const Aarray = nlarray[0].split('');
const Barray = nlarray[1].split('');

Aarray.sort();
Barray.sort();

let sum = 0;
for (let i = 0;i < Aarray.length; i++) {
    if (Aarray[i] === Barray[i]) {
        sum += 1;
    }
}
if (sum === Aarray.length) {
    console.log('YES');
} else {
    console.log('NO');
}