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lettersum = t => t.toLowerCase().split("").filter(s => s.match(/[a-z]/)).map(l => l.codePointAt(0) - 96).reduce((a, b) => a + b);

modpow = (b, e, m) => {
    let r = 1;
    while (e > 0) {
        r = (r * b) % m;
        e--;
    }
    return r;
};

const s = lettersum("text");
console.log(modpow(s, s, 8191));