function Main(input) {
    var inputArr = input.split('\n');
    var a = inputArr[0];
    var b = inputArr[1];

    ans = (sort(a) === sort(b))? 'YES' : 'NO';

    console.log(ans);
}

function sort(str) {
    return str.split('').sort().join('');
}

// Don't edit this line!
Main(require("fs").readFileSync("/dev/stdin", "utf8"));