function main(arg) {
    arg  = arg.split("\n")
    var s = arg[0]
    var t = arg[1]

    while (1) {
        if (s === "") {
            break
        } 

        s = s.split(s[0]).join("")
        t = t.split(t[0]).join("")

        if (s.length !== t.length) {
            console.log('No')
            return;
        }
    }
    console.log('Yes')
}
main(require('fs').readFileSync('/dev/stdin', 'utf8'));