processWords('number', ['1', '2', '2', '2', '3']); // 2umber n

processWords('elephant', ['ant', 'ant', 'ant', 'bee']); // alephant ent

processWords('nope', ['hello', 'hello', 'hello', 'bye']); // hope nello

processWords('nope', ['hello', 'hello', 'bye', 'bye']); // null

processWords('nope', ['hello', 'bye', 'bye', 'bye']); // bope nye

function processWords(input, arr) {

const counts = {};

let majorityWord = null;

for (const item of arr) {

counts[item] = (counts[item] || 0) + 1;

if (counts[item] >

) {

majorityWord = item;

break;

}

}

if (

) return null;

const processed = `${majorityWord[0]}${input.slice(1)} ${

}${majorityWord.slice(1)}`;

return processed;

}