var decodeMessage = function(key, message) {
let result = ''
const keys = Array.from(new Set(key.split(' ').join('')))
const hash = new Map()
const alpha = 'abcdefghijklmnopqrstuvwxyz'
for (let i = 0; i < alpha.length; i++) {
hash.set(keys[i], alpha[i])
}
for (let chr of message) {
result += hash.get(chr) || ' '
}
return result
};