golf-wip.js

const t = readline();

keyCodeMap = {}
addRangeToKeyCodeMap = (start, len) => {
    for (i = 0; i < len; i++) {
        keyCodeMap[start + i] = start + len - 1 - i
    }
}

addLatinToKeyCodeMap = start => addRangeToKeyCodeMap(start, 26)

// Uppercase
// 65 = A 90 = Z
addLatinToKeyCodeMap(65)

// Lowercase
// 97 = a 122 = z
addLatinToKeyCodeMap(97)

// Numbers
// 48 = 0, 57 = 9
addRangeToKeyCodeMap(48, 10)

// [ = 91
// ] = 93
// } = 125
// { = 123
// ( = 40
// ) = 41
keyCodeMap[91] = 93
keyCodeMap[93] = 91
keyCodeMap[125] = 123
keyCodeMap[123] = 125
keyCodeMap[40] = 41
keyCodeMap[41] = 40

console.log([...t].map(l=>{
    mapKey = keyCodeMap[l.charCodeAt(0)]
    if (!mapKey) return l;
    return String.fromCharCode(mapKey)
}).join(''))

// Write an answer using console.log()
// To debug: console.error('Debug messages...');